Rainbow Electronics AT89C5122 - Manual (Page 36)

36
AT8xC5122/23
4202E–SCR–06/06
SFR’s Description
Note: 1. Only for AT8xC5122
Note: 1. Only for AT8xC5122
Table 10. C51 Core SFRs
Mnemonic Add Name 7 6 5 4 3 2 1 0
ACC E0h Accumulator ACC
B F0h B Register B
PSW D0h Program Status Word CY AC F0 RS1 RS0 OV F1 P
SP 81h Stack Pointer SP
DPL 82h
Data Pointer Low byte (LSB
of DPTR)
DPL
DPH 83h
Data Pointer High byte
(MSB of DPTR)
DPH
Table 11. Clock SFRs
Mnemonic Add Name 7 6 5 4 3 2 1 0
PCON 87h Power Controller SMOD1 SMOD0 POF GF1 GF0 PD IDL
CKCON0 8Fh Clock Controller 0 WDX2 SIX2 T1X2 T0X2 X2
CKCON1 AFh Clock Controller 1 SPIX2
CKSEL 85h Clock Selection CKS
CKRL 97h Clock Reload Register CKREL 3-0
PLLCON A3h PLL Controller Register EXT48 PLLEN PLOCK
PLLDIV A4h PLL Divider register R3-0 N3-0
AUXR 8Eh Auxiliary Register 0 DPU XRS0 EXTRAM A0
AUXR1 A2h Auxiliary Register 1 ENBOOT (1) GF3 DPS
RCON (1) D1h
CRAM memory
Configuration
RPS
Table 12. I/O Port SFRs
Mnemonic Add Name 7 6 5 4 3 2 1 0
P0 (1) 80h Port 0 P0
P1 90h Port 1 P1
P2 (1) A0h Port 2 P2
P3 B0h Port 3 P3
P4 (1) C0h Port 4 P4
P5 E8h Port 5 P5 (only P5.0 for AT8xC5122)
PMOD0 91h Port Mode Register 0 P3C1 P3C0 P2C1 (1) P2C0 (1) CPRESRES - P0C1 (1) P0C0 (1)
PMOD1 84h Port Mode Register 1 P5HC1 (1) P5HC0 (1) P5MC1 (1) P5MC0 (1) P5LC1 P5LC0 P4C1 (1) P4C0 (1)