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AT89C51 Datasheet(PDF) 1 Page - ATMEL Corporation

Part # AT89C51
Description  8-Bit Microcontroller with 4K Bytes Flash
Download  15 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51 Datasheet(HTML) 1 Page - ATMEL Corporation

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background image
4-29
PQFP/TQFP
23
1
I NDEX
CORNER
34
42
43
40
41
6
5
4
44
3
2
26
25
28
27
24
18
19
20
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22
P1.7
P1.6
P1.5
NC
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NC
PSEN
ALE/PR OG
EA/VPP
(RX D )
P 3.0
P0.7
( A D7)
P2.6
(A14)
P0.6
( A D6)
P0.5
( A D5)
P0.4
( A D4)
()
P 3 . 2
INT0
(TX D )
P 3.1
(T1)
P 3 .5
()
P 3 . 3
INT1
(T0)
P 3 .4
P2.7
(A15)
RST
P2.5
(A13)
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
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 con-
ventional 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 appli-
cations.
PDIP
P1.0
V CC
P1.1
P0.0
( A D0)
P1.2
()
P 3 . 2
INT0
ALE/PR OG
()
P 3 . 7
RD
P2.3
(A11)
(TX D )
P 3.1
EA/VPP
()
P 3 . 6
WR
P2.4
(A12)
(RX D )
P 3.0
P0.7
( A D7)
(T1)
P 3 .5
P2.6
(A14)
RST
P0.6
( A D6)
P1.7
P0.5
( A D5)
P1.6
P0.4
( A D4)
P1.5
P0.3
( A D3)
P1.4
P0.2
( A D2)
P1.3
P0.1
( A D1)
()
P 3 . 3
INT1
PSEN
XTAL2
P 2.2
( A10)
(T0)
P 3 .4
P2.7
(A15)
XTAL1
P 2.1
( A9)
GND
P 2.0
( A 8 )
P2.5
(A13)
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0265F-A–12/97
(continued)
8-Bit
Microcontroller
with 4K Bytes
Flash
AT89C51
Pin Configurations
PLCC
ALE/PR OG
EA/VPP
(RX D ) P 3.0
P0.7 ( A D7)
P2.6 (A14)
P0.6 ( A D6)
P0.5 ( A D5)
P0.4 ( A D4)
PSEN
() P 3 . 2
INT0
(TX D ) P 3.1
(T1) P 3 .5
() P 3 . 3
INT1
(T0) P 3 .4
P2.7 (A15)
23
1
RST
P1.7
P1.6
P1.5
I NDEX
CORNER
NC
P2.5 (A13)
34
NC
42
43
40
41
6
5
44 4
3
2
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25
28
27
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19
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21
22
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