
C161K
C161O
Data Sheet
24
V2.0, 2001-01
Special Function Registers Overview
The following table lists all SFRs which are implemented in the C161K/O in alphabetical
order.
Bit-addressable SFRs are marked with the letter “b” in column “Name”. SFRs within the
Extended SFR-Space (ESFRs) are marked with the letter “E” in column “Physical
Address”. Registers within on-chip X-peripherals are marked with the letter “X” in column
“Physical Address”.
An SFR can be specified via its individual mnemonic name. Depending on the selected
addressing mode, an SFR can be accessed via its physical address (using the Data
Page Pointers), or via its short 8-bit address (without using the Data Page Pointers).
Note: The shaded registers are only available in the C161O, not in the C161K.
Table 6
C161K/O Registers, Ordered by Name
Name
Physical
Address
8-Bit
Addr.
Description
Reset
Value
ADDRSEL1
FE18H
0CH
Address Select Register 1
0000H
ADDRSEL2
FE1AH
0DH
Address Select Register 2
0000H
ADDRSEL3
FE1CH
0EH
Address Select Register 3
0000H
ADDRSEL4
FE1EH
0FH
Address Select Register 4
0000H
BUSCON0 b FF0CH
86H
Bus Configuration Register 0
0XX0H
BUSCON1 b FF14H
8AH
Bus Configuration Register 1
0000H
BUSCON2 b FF16H
8BH
Bus Configuration Register 2
0000H
BUSCON3 b FF18H
8CH
Bus Configuration Register 3
0000H
BUSCON4 b FF1AH
8DH
Bus Configuration Register 4
0000H
CAPREL
FE4AH
25H
GPT2 Capture/Reload Register
0000H
CC10IC
b FF8CH
C6H
EX2IN Interrupt Control Register
0000H
CC11IC
b FF8EH
C7H
EX3IN Interrupt Control Register
0000H
CC12IC
b FF90H
C8H
EX4IN Interrupt Control Register
0000H
CC13IC
b FF92H
C9H
EX5IN Interrupt Control Register
0000H
CC14IC
b FF94H
CAH
EX6IN Interrupt Control Register
0000H
CC15IC
b FF96H
CBH
EX7IN Interrupt Control Register
0000H
CC9IC
b FF8AH
C5H
EX1IN Interrupt Control Register
0000H
CP
FE10H
08H
CPU Context Pointer Register
FC00H
CRIC
b FF6AH
B5H
GPT2 CAPREL Interrupt Ctrl. Reg.
0000H
CSP
FE08H
04H
CPU Code Seg. Pointer Reg. (read only)
0000H