tsc251g1dxxx-l12ced ATMEL Corporation, tsc251g1dxxx-l12ced Datasheet - Page 13

• Manufacturer Part Number: tsc251g1dxxx-l12ced
• Description: 8/16-bit Microcontroller With Serial Communication Interfaces - 32kbytes Rom
• Manufacturer: ATMEL Corporation

Special Function
Registers
4135F–8051–11/06
The Special Function Registers (SFRs) of the TSC80251G2D derivatives fall into the
categories detailed in Table 1 to Table 9.
SFRs are placed in a reserved on-chip memory region S: which is not represented in the
data memory mapping (Figure 5). The relative addresses within S: of these SFRs are
provided together with their reset values in Table . They are upward compatible with the
SFRs of the standard 80C51 and the Intel’s 80C251Sx family. In this table, the C251
core registers are identified by Note 1 and are described in the TSC80251 Program-
mer’s Guide. The other SFRs are described in the TSC80251G1D Design Guide. All the
SFRs are bit-addressable using the C251 instruction set.
Table 1. C251 Core SFRs
Note:
Table 2. I/O Port SFRs
Table 3. Timers SFRs
ACC
B
PSW
PSW1
SP
Mnemonic
(1)
Mnemonic
(1)
Mnemonic
(1)
TCON
TH0
TH1
TH2
TL0
TL1
TL2
P0
P1
1. These SFRs can also be accessed by their corresponding registers in the register
file.
Name
Accumulator
B Register
Program Status Word
Program Status Word 1
Stack Pointer - LSB of SPX
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
Name
Port 0
Port 1
SPH
DPL
DPH
DPXL
Mnemonic
AT/TSC8x251G2D
(1)
(1)
(1)
(1)
Mnemonic
Mnemonic
WDTRST
RCAP2H
RCAP2L
T2MOD
T2CON
TMOD
P2
P3
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
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
Name
Port 2
Port 3
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