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The Atmel AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pin out. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful micro controller which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89S52 provides the following standard features like 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes.
The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning.
|
1 |
P1.0 (T2) |
Timer/Counter or 0th GPIO pin of PORT 1 |
|
2 |
P1.1 (T2.EX) |
Timer/Counter/External Counter or 1st GPIO pin of PORT 1 |
|
3 |
P1.2 |
2nd GPIO pin of PORT 1 |
|
4 |
P1.3 |
3rd GPIO pin of PORT 1 |
|
5 |
P1.4 |
4th GPIO pin of PORT 1 |
|
6 |
P1.5 (MOSI) |
MOSI for in System Programming or 5th GPIO pin of PORT 1 |
|
7 |
P1.6 (MISO) |
MISO for in System Programming or 6th GPIO pin of PORT 1 |
|
8 |
P1.7 (SCK) |
SCK for in System Programming or 7th GPIO pin of PORT 1 |
|
9 |
RST |
Making this pin high will reset the Microcontroller |
|
10 |
P3.0 (RXD) |
RXD Serial Input or 0th GPIO pin of PORT 3 |
|
11 |
P3.1 (TXD) |
TXD Serial Output or 1st GPIO pin of PORT 3 |
|
12 |
P3.2 (INT0’) |
External Interrupt 0 or 2nd GPIO pin of PORT 3 |
|
13 |
P3.3 (INT1’) |
External Interrupt 1 or 3rd GPIO pin of PORT 3 |
|
14 |
P3.4 (T0) |
Timer 0 or 4th GPIO pin of PORT 3 |
|
15 |
P3.5 (T1) |
Timer 1 or 5th GPIO pin of PORT 3 |
|
16 |
P3.6 (WR’) |
Memory Write or 6th GPIO pin of PORT 3 |
|
17 |
P3.7 (RD’) |
Memory Read or 7th GPIO pin of PORT 3 |
|
18 |
XTAL2 |
External Oscillator Output |
|
19 |
XTAL1 |
External Oscillator Input |
|
20 |
GND |
Ground pin of MCU |
|
21 |
P2.0(A8) |
0th GPIO pin of PORT 2 |
|
22 |
P2.1 (A9) |
1st GPIO pin of PORT 2 |
|
23 |
P2.2 (A10) |
2nd GPIO pin of PORT 2 |
|
24 |
P2.3 (A11) |
3rd GPIO pin of PORT 2 |
|
25 |
P2.4 (A12) |
4th GPIO pin of PORT 2 |
|
26 |
P2.5 (A13) |
5th GPIO pin of PORT 2 |
|
27 |
P2.6 (A14) |
6th GPIO pin of PORT 2 |
|
28 |
P2.7 (A15) |
7th GPIO pin of PORT 2 |
|
29 |
PSEN’ |
Program store Enable used to read external program memory |
|
30 |
ALE / PROG’ |
Address Latch Enable / Program Pulse Input |
|
31 |
EA’ / VPP |
External Access Enable / Programming enable Voltage |
|
32 |
P0.7 (AD7) |
Address / Data pin 7 or 7th GPIO pin of PORT 0 |
|
33 |
P0.6 (AD6) |
Address / Data pin 6 or 6th GPIO pin of PORT 0 |
|
34 |
P0.5 (AD5) |
Address / Data pin 5 or 5th GPIO pin of PORT 0 |
|
35 |
P0.4 (AD4) |
Address / Data pin 4 or 4th GPIO pin of PORT 0 |
|
36 |
P0.3 (AD3) |
Address / Data pin 3 or 3rd GPIO pin of PORT 0 |
|
37 |
P0.2 (AD2) |
Address / Data pin 2 or 2nd GPIO pin of PORT 0 |
|
38 |
P0.1 (AD1) |
Address / Data pin 1 or 1st GPIO pin of PORT 0 |
|
39 |
P0.0 (AD0) |
Address / Data pin 0 or 0th GPIO pin of PORT 0 |
|
40 |
VCC |
Positive pin of MCU (+5V) |
| Programmable (ISP) Flash Memory |
8K Bytes |
| Endurance | 1000 Write/Erase Cycles |
| Operating Range | 4.0V to 5.5V |
| Fully Static Operation | 0 Hz to 33 MHz |
| Internal RAM | 256 x 8-bit |
| Programmable I/O Lines | 32 |
| Dimensions | 40x15x4mm |
| Weight | 2g |
