1
8TQFP
23
1
INDEX
CORNER
34
P1.0 VCCP1.1P1.2P1.4 P1.3 NC
42
43
40
41
6
5
4
44
3
2
26
25
28
27
24
18
19
20
21
22
P1.7
P1.6
P1.5
NC
7
8
9
10
11
12
13
14
15
16
17
29
30
39
38
37
36
35
33
32
31
NC
PSEN
XT
AL1
GND
XT
AL2
GND
P0.0
(AD0)
ALE/PROG
()
P
3
.
7
RD
EA/VPP
()
P
3
.
6
WR
(RXD) P3.0
P0.7 (AD7)
P2.6 (A14)
P0.6 (AD6)
P0.5 (AD5)
P0.4 (AD4)
P0.3
(AD3)
P0.2
(AD2)
P0.1
(AD1)
()P3.2INT0
(TXD) P3.1
(T1) P3.5
()P3.INT1
(T0) P3.4
P2.7 (A15)
(A11)
P2.3
(A12)
P2.4
(A10)
P2.2
(A
9)
P
2
.1
(A
8)
P
2
.0
RST
P2.5 (A13)
Features
• Compatible with MCS-51™ Products
• 4K Bytes of User Programmable QuickFlash™ Memory
• 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 AT87F51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K
bytes of QuickFlash Programmable Read Only Memory. 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 QuickFlash
allows the program memory to be user programmed by a conventional nonvolatile
memory programmer. By combining a versatile 8-bit CPU with QuickFlash on a mono-
lithic chip, the Atmel AT87F51 is a powerful microcomputer which provides a highly
flexible and cost effective solution to many embedded control applications.
PDIP
P1.0 VCC
P1.1 P0.0 (AD0)
P1.2
()P3.2INT0
ALE/PROG
()P3.7RD P2.3 (A11)
(TXD) P3.1
EA/VPP
()P3.6WR P2.4 (A12)
(RXD) P3.0
P0.7 (AD7)
(T1) P3.5
P2.6 (A14)
RST
P0.6 (AD6)P1.7
P0.5 (AD5)P1.6
P0.4 (AD4)P1.5
P0.3 (AD3)P1.4
P0.2 (AD2)P1.3
P0.1 (AD1)
().INT1
PSEN
XTAL2 P2.2 (A10)
(T0) P3.4
P2.7 (A15)
XTAL1 P2.1 (A9)
GND P2.0 (A8)
P2.5 (A13)
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
21
22
23
24
25
26
40
39
38
37
36
35
34
33
32
31
30
29
28
27
Rev. 1012A–02/98
(continued)
8-Bit
Microcontroller
with 4K Bytes
QuickFlash
™
AT87F51
Pin Configurations
PLCC
P1.0 VCCP1.1 P0.0
(AD0)
P1.2
ALE/PROG
()
P
3
.
7
RD
XT
AL1
EA/VPP
()
P
3
.
6
WR
GND
(RXD) P3.0
P0.7 (AD7)
P2.6 (A14)
P0.6 (AD6)
P0.5 (AD5)
P0.4 (AD4)
P0.3
(AD3)
P1.4 P0.2
(AD2)
P1.3 P0.1
(AD1)
PSEN
XT
AL2
()P3.2INT0
(TXD) P3.1
(T1) P3.5
()P3.INT1
(T0) P3.4
P2.7 (A15)
(A11)
P2.3
(A12)
P2.4
(A10)
P2.2
(A
9)
P
2
.1
(A
8)
P
2
.0
NC
23
1
RST
P1.7
P1.6
P1.5
INDEX
CORNER
NC
NC
P2.5 (A13)
34 NC
42
43
40
41
6
5
444
3
2
26
25
28
27
18
19
20 24
21
22
7
8
9
10
11
12
13
14
15
16
17 29
30
39
38
37
36
35
33
32
31