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DS5000(T) Datasheet

  • DS5000(T)

  • Soft Microcontroller Module

  • 19頁

  • ETC

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DS5000T
Soft Microcontroller Module
www.maxim-ic.com
FEATURES
摟
8-bit 8051-compatible microcontroller adapts
to task at hand:
- 8 or 32 kbytes 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
unauthorized disclosure
On-chip, full-duplex serial I/O ports
Two on-chip timer/event counters
32 parallel I/O lines
Compatible with industry standard 8051
instruction set and pinout
Optional permanently powered real time
clock (DS5000T)
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
摟
摟
摟
摟
摟
摟
摟
40-Pin Encapsulated Package
DESCRIPTION
The DS5000(T) Soft Microcontroller Module is a fully 8051-compatible 8-bit CMOS microcontroller that
offers 鈥渟oftness鈥?in all aspects of its application. This is accomplished through the comprehensive use of
nonvolatile technology to preserve all information in the absence of system V
CC
. The internal
program/data memory space is implemented using either 8 or 32 kbytes 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 onboard crystal.
Note:
Some revisions of this device may incorporate deviations from published specifications known
as errata. Multiple revisions of any device may be simultaneously available through various sales
channels. For information about device errata, click here:
http://dbserv.maxim-ic.com/errata.cfm.
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