AT89C5131A-RDTIM Atmel, AT89C5131A-RDTIM Datasheet - Page 14

• Manufacturer Part Number: AT89C5131A-RDTIM
• Description: C5131A 32K FLASH USB VQFP64 IND, 5V
• Manufacturer: Atmel

14
AT89C5131
The Special Function Registers (SFRs) of the AT89C5131 fall into the following
categories:
Table 14. C51 Core SFRs
Table 15. I/O Port SFRs
Mnemonic
Mnemonic
PSW
ACC
DPH
DPL
SP
P0
P1
P2
P3
P4
B
Add
Add
E0h
F0h
D0h
A0h
B0h
C0h
81h
82h
83h
80h
90h
Name
Accumulator
B Register
Program Status
Word
Stack Pointer
LSB of SPX
Data Pointer
Low byte
LSB of DPTR
Data Pointer
High byte
MSB of DPTR
Name
Port 0
Port 1
Port 2
Port 3
Port 4 (x2)
7
7
6
6
5
5
4
4
3
3
2
2
4136C–USB–04/05
1
1
0
0