Rainbow Electronics T89C51AC2 - Manual (Page 10)

10
T89C51AC2
Rev. B – 19-Dec-01
5. SFR Mapping
The Special Function Registers (SFRs) of the T89C51AC2 fall into the following
categories:
Table 3. C51 Core SFRs
Table 4. I/O Port SFRs
Table 5. Timers SFRs
Mnemonic Add Name 7 6 5 4 3 2 1 0
ACC E0h Accumulator
B F0h B Register
PSW D0h Program Status Word CY AC F0 RS1 RS0 OV F1 P
SP 81h Stack Pointer
DPL 82h
Data Pointer Low
byte
LSB of DPTR
DPH 83h
Data Pointer High
byte
MSB of DPTR
Mnemonic Add Name 7 6 5 4 3 2 1 0
P0 80h Port 0
P1 90h Port 1
P2 A0h Port 2
P3 B0h Port 3
P4 C0h Port 4 (x2) - - - - - -
Mnemonic Add Name 7 6 5 4 3 2 1 0
TH0 8Ch
Timer/Counter 0 High
byte
TL0 8Ah
Timer/Counter 0 Low
byte
TH1 8Dh
Timer/Counter 1 High
byte
TL1 8Bh
Timer/Counter 1 Low
byte
TH2 CDh
Timer/Counter 2 High
byte
TL2 CCh
Timer/Counter 2 Low
byte
TCON 88h
Timer/Counter 0 and
1 control
TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0
TMOD 89h
Timer/Counter 0 and
1 Modes
GATE1 C/T1# M11 M01 GATE0 C/T0# M10 M00