Sfr’s description – Rainbow Electronics AT89C5122 User 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)