on November 22th 4,344

AT89S52-24PU Microcontroller: Alternatives, Pinout, and Datasheet

This article explores the AT89S52-24PU microcontroller, highlighting its characteristics, practical uses, and how it efficiently handles power and performance in demanding applications. Renowned for its 8K bytes of Flash memory and low power consumption, this device is ideal looking to balance energy efficiency with robust functionality in battery-powered devices.

Catalog

What is the AT89S52-24PU?

The AT89S52-24PU microcontroller is a highly flexible device that integrates an 8-bit CPU with programmable Flash memory on a single chip. By harnessing Atmel's advanced nonvolatile memory technology, this microcontroller maintains compatibility with the esteemed 80C51 instruction set. Its on-chip reprogrammable Flash caters to the diverse needs of various embedded control systems in a manner that is both efficient and cost-effective. The microcontroller features 8K of Flash and 256 bytes of RAM, providing ample capacity for intricate programming and catering to applications demanding complex data processing. The inclusion of 32 general-purpose I/O lines offers the versatility to connect a wide range of peripherals.

With three 16-bit timer/counters, the AT89S52-24PU supports precise time-based functions, which are invaluable for data processing and control settings. The dual data pointers enhance data handling efficiency, supporting rapid data transfer scenarios effectively. The Watchdog timer adds a layer of reliability by resetting the system during software irregularities, a feature cherished by sectors prioritizing long-term system integrity. The microcontroller's capacity for static operation at various frequencies aids in balancing performance with power consumption. The availability of power-saving modes, including Idle and Power-down, underscores its appropriateness for battery-operated applications, ensuring memory content retention during power-down phases. These features address energy efficiency concerns, as evidenced by its adoption in portable and remotely-operated devices.

AT89S52-24PU Pin Configuration

Pin No	Pin Name	Description
1-8	Port 1	Interface 1 has internal pull-ups and is an 8-bit bidirectional I/O port. Four TTL inputs can be sink/source in the Port 1 output buffers. When 1s are written to Port 1 pins, the internal pull-ups pull them high, allowing them to be used as inputs. Because of the internal pull-ups, Port 1 pins that are externally pushed low will source current (IIL) as inputs. In addition, as shown in the table, P1.0 and P1.1 can be set to be the timer/counter 2 external count input (P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively. During Flash programming and verification, Port 1 also receives the low-order address bytes.
9	RST	Input should be reset. While the oscillator is functioning, a high on this pin for two machine cycles resets the device. After the Watchdog has timed out, this pin goes high for 98 oscillator periods. This feature can be disabled using the DISRTO bit in SFR AUXR (address 8EH). The RESET HIGH out capability is enabled by default in bit DISRTO.
10-17	Port 3	Port 3 is an internal pull-up 8-bit bidirectional I/O port. Four TTL inputs can be sunk or sourced using the Port 3 output buffers. When 1s are written to Port 3 pins, the internal pull-ups pull them high, allowing them to be used as inputs. Because of the pull-ups, Port 3 pins that are externally pulled low will source current (IIL) as inputs. For Flash programming and verification, Port 3 receives some control signals. As stated in the chart below, Port 3 also supports the functions of numerous AT89S52 special features.
18	XTAL2	Output from the inverting oscillator amplifier.
19	XTAL1	Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
20	GND	Ground.
21-28	Port 2	Port 2 is an internal pull-up 8-bit bidirectional I/O port. Four TTL inputs can be sink/source in the Port 2 output buffers. When 1s are written to Port 2 pins, the internal pull-ups pull them high, allowing them to be used as inputs. Because of the internal pull-ups, Port 2 pins that are externally pushed low will source current (IIL) as inputs. During fetches from external program memory and accesses to external data memory that use 16-bit addresses (MOVX @ DPTR), Port 2 emits the high-order address byte. When transmitting 1s, Port 2 uses powerful internal pull-ups in this application. Port 2 emits the contents of the P2 Special Function Register during 8-bit address accesses to external data memory (MOVX @ RI). During Flash programming and verification, Port 2 additionally gets the high-order address bits and various control signals.
29	PSEN	The read strobe to external program memory is called Program Store Enable (PSEN). PSEN is activated twice each machine cycle when the AT89S52 is running code from external program memory, with two PSEN activations ignored during each access to external data memory.
30	ALE/PROG	The Address Latch Enable (ALE) output pulse is used to latch the low byte of the address during external memory accesses. During Flash programming, this pin also serves as the program pulse input (PROG). ALE is released at a steady rate of 1/6 the oscillator frequency in normal operation and can be used for external timing or clocking. However, during each access to external data memory, one ALE pulse is skipped. Setting bit 0 of SFR location 8EH to 0 disables ALE functioning if desired. ALE is only active when the bit is set via a MOVX or MOVC instruction. Otherwise, the pin is lifted high but weakly. If the microcontroller is in external execution mode, setting the ALE-disable bit has no effect.
31	EA/VPP	External Access is turned on. To enable the device to fetch code from external program memory regions beginning at 0000H and ending at FFFFH, EA must be connected to GND. If lock bit 1 is coded, however, EA will be internally latched on reset. For internal program executions, EA should be tied to VCC. During Flash programming, this pin additionally receives the 12-volt programming enable voltage (VPP).
32-39	Port 0	Interface 0 is a bidirectional 8-bit open drain I/O port. Each pin can sink eight TTL inputs as an output port. The pins on port 0 can be used as high-impedance inputs when 1s are written to them. During accesses to external program and data memory, Port 0 can also be set as the multiplexed low-order address/data bus. P0 features internal pull-ups in this mode. During Flash programming, Port 0 also gets the code bytes and outputs them during program verification. During program verification, external pull-ups are required.
40	VCC	Supply voltage.

AT89S52-24PU Symbol, Footprint, and CAD Model

AT89S52-24PU Symbol

AT89S52-24PU Footprint

AT89S52-24PU CAD Model

Features of the AT89S52-24PU

• MCS®-51 Standard Compliance: Fully compatible with the MCS®-51 standard, ensuring robust and reliable performance.

• 8K ISP Flash Memory: Stores large programs. Supports up to 10,000 write/erase cycles, ideal for long-term applications.

• Wide Operating Voltage (4V–5.5V): Adapts to various power supply environments.

• High-Speed Operation: Handles static conditions up to 33 MHz, balancing energy efficiency with performance needs.

• Enhanced Security: Memory lock features protect intellectual property. Prevents unauthorized access or modifications.

• Flexible I/O and Timer Functions: Easy integration with sensors and devices. Precise control for time applications requiring accurate timing.

• Dual Data Pointers: Boosts efficiency in data-heavy tasks like signal processing and communication. Simplifies data stream handling.

• Energy-Saving Modes: Idle and Power-down modes reduce energy consumption. Optimized for portable devices and sustainable designs.

AT89S52-24PU Technical Specifications

Type	Parameter
Factory Lead Time	7 Weeks
Mount	Through Hole
Package / Case	40-DIP (0.600, 15.24mm)
Number of I/Os	32
Operating Temperature	-40°C~85°C TA
Series	89S
JESD-609 Code	e3
Part Status	Active
Number of Terminations	40
Supply Voltage	5V
Frequency	33MHz
Operating Supply Voltage	5V
Interface	UART
Contact Plating	Tin
Mounting Type	Through Hole
Number of Pins	40
Watchdog Timers	Yes
Packaging	Tube
Published	1997
Pbfree Code	yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Terminal Position	DUAL
Terminal Pitch	2.54mm
Base Part Number	AT89S52
Power Supplies	5V
Memory Size	8kB
Speed	24 MHz
Voltage - Supply (Vcc/Vdd)	4V~5.5V
Number of Bits	8
Peripherals	WDT
Core Size	8-Bit
Connectivity	UART/USART
Access Time	24 µs
DMA Channels	NO
PWM Channels	NO
Number of Timers/Counters	3
Number of UART Channels	1
Length	52.58mm
REACH SVHC	No SVHC
RoHS Status	ROHS3 Compliant
Oscillator Type	Internal
RAM Size	256 x 8
uPs/uCs/Peripheral ICs Type	MICROCONTROLLER
Core Processor	8051
Program Memory Type	FLASH
Program Memory Size	8KB 8K x 8
Bit Size	8
Has ADC	NO
Data Bus Width	8b
DAC Channels	NO
Address Bus Width	8b
Height	4.826mm
Width	13.97mm
Radiation Hardening	NO
Lead Free	Lead Free

AT89S52-24PU Similar Parts

The three components listed to the right are similar in specifications to those of Microchip Technology AT89S52-24PU.

Part Number	Manufacturer	Package / Case	Number of Pins	Data Bus Width	Number of I/O	Interface	Memory Size	Supply Voltage	Peripherals
AT89S52-24PU	Microchip Technology	40-DIP (0.600, 15.24mm)	40	8 b	32	UART	8 kB	5 V	WDT
AT89C55WD-24PU	Microchip Technology	40-DIP (0.600, 15.24mm)	40	8 b	32	SPI, UART, USART	32 kB	5 V	WDT
AT89S51-24PU	Microchip Technology	40-DIP (0.600, 15.24mm)	40	8 b	32	UART, USART	4 kB	5 V	WDT
AT89C51RC-24PU	Microchip Technology	40-DIP (0.600, 15.24mm)	40	8 b	32	UART, USART	20 kB	-	WDT

Functional Block Diagram of the AT89S52-24PU

The diagram below illustrates the functional block structure of the AT89S52-24PU.

Programming the Flash Memory (Parallel Mode)

The figure below illustrates the process of programming the Flash memory of the AT89S52-24PU in parallel mode.

Verifying the Flash Memory (Parallel Mode)

The figure below demonstrates the process of verifying the flash memory in parallel mode for the AT89S52-24PU.

Flash Memory Serial Downloading

The figure below illustrates the Serial Downloading process for the AT89S52-24PU Flash Memory.

Alternatives of the AT89S52-24PU

Part Number	Description	Manufacturer
AT87F52-24PC	Microcontroller, 8-Bit, FLASH, 8051 CPU, 24MHz, CMOS, PDIP40, 0.600 INCH, PLASTIC, DIP-40	Atmel Corporation
AT87F52-24PI	Microcontroller, 8-Bit, FLASH, 8051 CPU, 24MHz, CMOS, PDIP40, 0.600 INCH, PLASTIC, DIP-40	Atmel Corporation
AT87F52-24PL	Microcontroller, 8-Bit, FLASH, 24MHz, CMOS, PDIP40, 0.600 INCH, PLASTIC, DIP-40	Atmel Corporation

Applications of the AT89S52-24PU

• Healthcare Monitoring: Enhances precision in medical monitoring devices.

• Automotive Safety: Integrates features like adaptive cruise control and lane assistance.

• DIY Electronics: Enables hobbyists to create custom devices.

• Consumer Electronics: Produces multifunctional and intuitive products.

• Smart Homes and Cities: Improves device communication for better energy management and convenience.

Package for AT89S52-24PU

AT89S52-24PU Manufacturer Information

Microchip Technology Inc., with its headquarters nestled in Chandler, Arizona, plays a role in the microcontroller and semiconductor industry. The company is distinguished by its steadfast dedication to pioneering advancements and maintaining high standards through product lines recognized for their reliability, which bolster development efficiency and economic prudence. By carefully refining its design and manufacturing processes, Microchip not only meets but surpasses industry benchmarks, nurturing a setting that encourages ongoing enhancement and system refinement. Microchip Technology Inc. is much more than a provider of microcontrollers and semiconductors; it actively molds the landscape in which these technologies are developed and utilized. Its strategic emphasis on efficiency, cost management, and quality control places it at the vanguard of the industry.

Datasheet PDF

AT89S52-24PU Datasheets:

AT89S52.pdf

Boxes 07/Dec/2016.pdf

Shipping Tube 19/Sep/2018.pdf

Marking Chgs 11/Jul/2017.pdf

Copper Bonding Wire 17/Oct/2013.pdf

AT89yyy 16/Jul/2020.pdf

AT89C55WD-24PU Datasheets:

Cylindrical Battery Holders.pdf

Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf

Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf

Shipping Tube 19/Sep/2018.pdf

Cylindrical Battery Holders.pdf

2.73KHz.pdf

AT89S51-24PU Datasheets:

Cylindrical Battery Holders.pdf

Marking Chgs 11/Jul/2017.pdf

Copper Bonding Wire 17/Oct/2013.pdf

Shipping Tube 19/Sep/2018.pdf

2.73KHz.pdf

AT89C51RC-24PU Datasheets:

AT89C51RC.pdf

MBB/Label Chgs 16/Nov/2018.pdf

Boxes 07/Dec/2016.pdf

Marking Chgs 11/Jul/2017.pdf

Mult Dev Assembly 25/May/2020.pdf