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AT89C51带4K字节闪存的8位微控制器数据手册
资料介绍
AT89C51是一款低功耗、高性能的CMOS 8位微型计算机，具有4K字节的闪存可编程和可擦除只读存储器（PEROM），该设备采用Atmel的高密度非易失性存储器技术制造，并与工业标准MCS-51指令集和引脚匹配。片上闪存允许程序存储器在系统中或由传统的非易失性存储器编程器重新编程。ATMEL AT89C51是一种功能强大的微型计算机，它通过将一个通用的8位CPU与Flash结合在一个单片芯片上，为许多嵌入式控制应用提供了一种高度灵活和成本有效的解决方案。
部分文件列表
| 文件名 | 大小 |
| AT89C51带4K字节闪存的8位微控制器数据手册.pdf | 263K |
部分页面预览
（完整内容请下载后查看）Features
• Compatible with MCS-51™ Products
• 4K Bytes of In-System Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 128 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Two 16-bit Timer/Counters
• Six Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
8-bit
Microcontroller
with 4K Bytes
Flash
Description
The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K
bytes of Flash programmable and erasable read only memory (PEROM). The device
is manufactured using Atmel’s high-density nonvolatile memory technology and is
compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip
Flash allows the program memory to be reprogrammed in-system or by a conven-
tional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash
on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides
a highly-flexible and cost-effective solution to many embedded control applications.
AT89C51
PDIP
Pin Configurations
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
1
2
3
4
5
6
7
8
9
40 VCC
39 P0.0 (AD0)
38 P0.1 (AD1)
37 P0.2 (AD2)
36 P0.3 (AD3)
35 P0.4 (AD4)
34 P0.5 (AD5)
33 P0.6 (AD6)
32 P0.7 (AD7)
31 EA/VPP
(RXD) P3.0 10
(TXD) P3.1 11
(INT0) P3.2 12
(INT1) P3.3 13
(T0) P3.4 14
(T1) P3.5 15
(WR) P3.6 16
(RD) P3.7 17
XTAL2 18
PQFP/TQFP
30 ALE/PROG
29 PSEN
28 P2.7 (A15)
27 P2.6 (A14)
26 P2.5 (A13)
25 P2.4 (A12)
24 P2.3 (A11)
23 P2.2 (A10)
22 P2.1 (A9)
21 P2.0 (A8)
XTAL1 19
P1.5
P1.6
1
2
3
4
5
6
7
8
9
33 PO.4 (AD4)
32 P0.5 (AD5)
31 P0.6 (AD6)
30 P0.7 (AD7)
29 EA/VPP
GND 20
P1.7
PLCC
RST
(RXD) P3.0
NC
28 NC
(TXD) P3.1
(INT0) P3.2
(INT1) P3.3
27 ALE/PROG
26 PSEN
25 P2.7 (A15)
24 P2.6 (A14)
23 P2.5 (A13)
(T0) P3.4 10
(T1) P3.5 11
P1.5
P1.6
P1.7
7
8
9
39 PO.4 (AD4)
38 P0.5 (AD5)
37 P0.6 (AD6)
36 P0.7 (AD7)
35 EA/VPP
RST 10
(RXD) P3.0 11
NC 12
34 NC
(TXD) P3.1 13
(INT0) P3.2 14
(INT1) P3.3 15
(T0) P3.4 16
(T1) P3.5 17
33 ALE/PROG
32 PSEN
31 P2.7 (A15)
30 P2.6 (A14)
29 P2.5 (A13)
Rev. 0265G–02/00
Block Diagram
P0.0 - P0.7
P2.0 - P2.7
VCC
PORT 0 DRIVERS
PORT 2 DRIVERS
GND
RAM ADDR.
REGISTER
PORT 0
LATCH
PORT 2
LATCH
RAM
FLASH
PROGRAM
ADDRESS
REGISTER
STACK
POINTER
B
ACC
REGISTER
BUFFER
TMP2
TMP1
PC
INCREMENTER
ALU
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PROGRAM
COUNTER
PSW
PSEN
ALE/PROG
EA / VPP
RST
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
DPTR
PORT 1
LATCH
PORT 3
LATCH
OSC
PORT 1 DRIVERS
P1.0 - P1.7
PORT 3 DRIVERS
P3.0 - P3.7
AT89C51
2
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