AT89C5131A-M(2005) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A-M
(Rev.:2005)

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

AT89C5130A/31A-M

The Special Function Registers (SFRs) of the AT89C5131 fall into the following

categories:

Table 21. C51 Core SFRs

Mnemonic Add Name

7

6

5

4

3

2

1

0

ACC

E0h Accumulator

B

F0h B Register

PSW

D0h

Program Status

Word

Stack Pointer

SP

81h

LSB of SPX

Data Pointer

DPL

82h Low byte

LSB of DPTR

DPH

Data Pointer

83h High byte

MSB of DPTR

Table 22. I/O Port SFRs

Mnemonic Add Name

P0

80h Port 0

P1

90h Port 1

P2

A0h Port 2

P3

B0h Port 3

P4

C0h Port 4 (2bits)

7

6

5

4

3

2

1

0

21

4337C–USB–02/05

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