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112299

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

FEATURES

§ 8051-compatible microprocessor adapts to its

task

- Accesses between 8kB and 64kB of

nonvolatile SRAM

- In-system programming via on-chip serial

port

- Can modify its own program or data

memory

- Accesses memory on a separate Byte-

wide bus

§ Crashproof operation

- Maintains all nonvolatile resources for

over 10 years

- Power-fail Reset

- Early Warning Power-fail Interrupt

- Watchdog Timer

- User-supplied lithium battery backs user

SRAM for program/data storage

§ Software security

- Executes encrypted programs to prevent

observation

- Security lock prevents download

- Unlocking destroys contents

§ Fully 8051-compatible

- 128 bytes scratchpad RAM

- Two timer/counters

- On-chip serial port

- 32 parallel I/O port pins

PIN ASSIGNMENT

DS5000FP

Soft Microprocessor Chip

www.maxim-ic.com

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

P0.4/AD4

NC

NC

BA9

P0.3/AD3

BA8

P0.2/AD2

BA13

P0.1/AD1

R/W

P0.0/AD0

VCC0

VCC

VCC

P1.0

BA14

P1.1

BA12

P1.2

BA7

P1.3

NC

NC

BA6

P2.6/A14

NC

NC

BD3

P2.5/A13

BD2

P2.4/A12

BD1

P2.3/A11

BD0

VLI

GND

GND

P2.2/A10

P2.1/A9

P2.0/A8

XTAL1

XTAL2

P3.7/RD

P3.6/WR

P3.5/T1

NC

NC

P3.4/T0

64

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

DS5000FP