TSC87251G1A
Table 3. C251 Core SFRs
Mnemonic
ACC
(1)
B
(1)
PSW
PSW1
SP
(1)
Name
Accumulator
B Register
Program Status Word
Program Status Word 1
Stack Pointer – LSB of SPX
Mnemonic
SPH
(1)
DPL
(1)
DPH
(1)
DPXL
(1)
Name
Stack Pointer High – MSB of SPX
Data Pointer Low byte – LSB of DPTR
Data Pointer High byte – MSB of DPTR
Data Pointer Extended Low byte of DPX – Region number
Note:
1. These SFRs can also be accessed by their corresponding registers in the register file.
Table 4. I/O Port SFRs
Mnemonic
P0
P1
Name
Port 0
Port 1
Mnemonic
P2
P3
Name
Port 2
Port 3
Table 5. Timers SFRs
Mnemonic
TL0
TH0
TL1
TH1
TL2
TH2
TCON
Name
Timer/Counter 0 Low Byte
Timer/Counter 0 High Byte
Timer/Counter 1 Low Byte
Timer/Counter 1 High Byte
Timer/Counter 2 Low Byte
Timer/Counter 2 High Byte
Timer/Counter 0 and 1 Control
Mnemonic
TMOD
T2CON
T2MOD
RCAP2L
RCAP2H
WDTRST
Name
Timer/Counter 0 and 1 Modes
Timer/Counter 2 Control
Timer/Counter 2 Mode
Timer/Counter 2 Reload/Capture Low Byte
Timer/Counter 2 Reload/Capture High Byte
WatchDog Timer Reset
Table 6. Serial I/O Port SFRs
Mnemonic
SCON
SBUF
SADEN
Name
Serial Control
Serial Data Buffer
Slave Address Mask
Mnemonic
SADDR
BRL
BDRCON
Name
Slave Address
Baud Rate Reload
Baud Rate Control
Table 7. SSLC SFRs
Mnemonic
SSCON
SSDAT
Name
Synchronous Serial control
Synchronous Serial Data
Mnemonic
SSCS
SSBR
Name
Synchronous Serial Control and Status
Synchronous Serial Bit Rate
10
Rev. A
–
September 21, 1998
TEMIC [ TEMIC SEMICONDUCTORS ]
