AT87F55WD Datasheet, PDF (1/26 Pages) ATMEL Corporation – 8-bit Microcontroller with 20K Bytes QuickFlash™

Features
• Compatible with MCS-51^™ Products
• 20K Bytes of One-time Programmable QuickFlash Memory
• 4V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 33 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode
• Hardware Watchdog Timer
• Dual Data Pointer
• Power-off Flag
Description
The AT87F55WD is a low-power, high-performance CMOS 8-bit microcomputer with
20K bytes of QuickFlash one-time programmable (OTP) read only memory and 256
bytes of RAM. The device is manufactured using Atmel’s high-density nonvolatile
memory technology and is compatible with the industry standard 80C51 and 80C52
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 monolithic chip, the Atmel AT87F55WD is a
powerful microcomputer which provides a highly-flexible and cost-effective solution to
many embedded control applications.
Pin Configurations
TQFP
P1.5 1
P1.6 2
P1.7 3
RST 4
(RXD) P3.0 5
NC 6
(TXD) P3.1 7
(INT0) P3.2 8
(INT1) P3.3 9
(T0) P3.4 10
(T1) P3.5 11
33 P0.4 (AD4)
32 P0.5 (AD5)
31 P0.6 (AD6)
30 P0.7 (AD7)
29 EA/VPP
28 NC
27 ALE/PROG
26 PSEN
25 P2.7 (A15)
24 P2.6 (A14)
23 P2.5 (A13)
PDIP
(T2) P1.0 1
(T2EX) P1.1 2
P1.2 3
P1.3 4
P1.4 5
P1.5 6
P1.6 7
P1.7 8
RST 9
(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
XTAL1 19
GND 20
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
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)
PLCC
8-bit
Microcontroller
with 20K Bytes
QuickFlash™
AT87F55WD
P1.5 7
P1.6 8
P1.7 9
RST 10
(RXD) P3.0 11
NC 12
(TXD) P3.1 13
(INT0) P3.2 14
(INT1) P3.3 15
(T0) P3.4 16
(T1) P3.5 17
39 P0.4 (AD4)
38 P0.5 (AD5)
37 P0.6 (AD6)
36 P0.7 (AD7)
35 EA/VPP
34 NC
33 ALE/PROG
32 PSEN
31 P2.7 (A15)
30 P2.6 (A14)
29 P2.5 (A13)
Rev. 1918A–08/00
1