DS87C520WCL Dallas Semiconductor, DS87C520WCL Datasheet
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DS87C520WCL
Manufacturer Part Number
DS87C520WCL
Description
CDIP-24
Manufacturer
Dallas Semiconductor
Datasheet
1.DS87C520WCL.pdf
(37 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS87C520WCL
Manufacturer:
TYCO
Quantity:
13 066
FEATURES
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
80C52 compatible
Large On–chip Memory
ROMSIZE Feature
High–Speed Architecture
Power Management Mode
EMI Reduction Mode disables ALE
Two full–duplex hardware serial ports
High integration controller includes:
13 total interrupt sources with 6 external
Available in 40–pin PDIP, 44–pin PLCC, 44–pin
TQFP, and 40–pin windowed CERDIP
Factory Mask DS83C520 or EPROM (OTP)
DS87C520
Copyright 1995 by Dallas Semiconductor Corporation.
– 8051 pin and instruction set compatible
– Four 8–bit I/O ports
– Three 16–bit timer/counters
– 256 bytes scratchpad RAM
– 16KB Program Memory
– 1KB extra on–chip SRAM for MOVX
– Selects internal ROM size from 0 to
– Allows access to entire external memory map
– Dynamically adjustable by software
– Useful as boot block for external FLASH
– 4 clocks/machine cycle (8051 = 12)
– Runs DC to 33 MHz clock rates
– Single–cycle instruction in 121 ns
– Dual data pointer
– Optional variable length MOVX to access fast/
– Programmable clock source to save power
– CPU runs from (crystal/64) or (crystal/1024)
– Provides automatic hardware and software exit
– Power–fail reset
– Early–warning power–fail interrupt
– Programmable Watchdog timer
16KB
slow RAM/peripherals
EPROM/ROM High–Speed Micro
PACKAGE OUTLINE
P1.2/RXD1
P3.0/RXD0
P1.1/T2EX
P1.3/TXD1
P3.1/TXD0
P1.4/INT2
P1.5/INT3
P1.6/INT4
P1.7/INT5
P3.2/INT0
P3.3/INT1
P3.6/WR
P3.7/RD
P1.0/T2
P3.4/T0
P3.5/T1
XTAL2
XTAL1
17
34
44
7
RST
V
SS
DS87C520/DS83C520
18
6
33
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40–PIN CER DIP
/DS83C520
DS87C520
/DS83C520
40–PIN PDIP
44–PIN PLCC
DS87C520
44–PIN TQFP
DALLAS
DS87C520
DS83C520
DALLAS
DALLAS
1
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
28
23
11
PRELIMINARY
DS87C520/DS83C520
39
29
EA/V
PSEN
VCC
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
ALE/PROG
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
P2.1
P2.0
22
12
110195 1/37
PP