DS5000(T)
DS5000(T)
Soft Microcontroller Module
FEATURES
PIN ASSIGNMENT
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
RXD P3.0
TXD P3.1
INT0 P3.2
INT1 P3.3
T0 P3.4
T1 P3.5
WR P3.6
RD P3.7
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
CC
P0.0 AD0
P0.1 AD1
P0.2 AD2
P0.3 AD3
P0.4 AD4
P0.5 AD5
P0.6 AD6
P0.7 AD7
EA
ALE
PSEN
P2.7 A15
P2.6 A14
P2.5 A13
P2.4 A12
P2.3 A11
P2.2 A10
P2.1 A9
P2.0 A8
•
8–bit 8051 compatible Microcontroller adapts to task–
at–hand:
– 8 or 32K bytes of nonvolatile RAM for program
and/or data memory storage
– Initial downloading of software in end system
via on–chip serial port
– Capable of modifying its own program and/or
data memory in end use
•
Crashproof operation:
– Maintains all nonvolatile resources for 10 years
in the absence of V
CC
– Power–fail reset
– Early warning power–fail interrupt
– Watchdog timer
•
Software Security Feature:
– Executes encrypted software to prevent unau-
thorized disclosure
•
On–chip, full–duplex serial I/O ports
•
Two on–chip timer/event counters
•
32 parallel I/O lines
•
Compatible with
set and pinout
industry standard 8051 instruction
40–PIN ENCAPSULATED PACKAGE
•
Optional
Permanently Powered Real–Time Clock
(DS5000T)
DESCRIPTION
The DS5000(T) Soft Microcontroller Module is a fully
8051 compatible 8–bit CMOS microcontroller that offers
“softness” in all aspects of its application. This is ac-
complished through the comprehensive use of nonvola-
tile technology to preserve all information in the ab-
sence of system V
CC
. The internal program/data
memory space is implemented using either 8K or
32K bytes of nonvolatile CMOS SRAM. Furthermore,
internal data registers and key configuration registers
are also nonvolatile. An optional real time clock gives
permanently powered timekeeping. The clock keeps
time to a hundredth of a second using an on–board
crystal.
021998 1/19
DALLAS [ DALLAS SEMICONDUCTOR ]
