Datasheet
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 FE18
H
0C
H
Address Select Register 1 0000
H
ADDRSEL2 FE1A
H
0D
H
Address Select Register 2 0000
H
ADDRSEL3 FE1C
H
0E
H
Address Select Register 3 0000
H
ADDRSEL4 FE1E
H
0F
H
Address Select Register 4 0000
H
BUSCON0 b FF0C
H
86
H
Bus Configuration Register 0 0XX0
H
BUSCON1 b FF14
H
8A
H
Bus Configuration Register 1 0000
H
BUSCON2 b FF16
H
8B
H
Bus Configuration Register 2 0000
H
BUSCON3 b FF18
H
8C
H
Bus Configuration Register 3 0000
H
BUSCON4 b FF1A
H
8D
H
Bus Configuration Register 4 0000
H
CAPREL FE4A
H
25
H
GPT2 Capture/Reload Register 0000
H
CC10IC b FF8C
H
C6
H
EX2IN Interrupt Control Register 0000
H
CC11IC b FF8E
H
C7
H
EX3IN Interrupt Control Register 0000
H
CC12IC b FF90
H
C8
H
EX4IN Interrupt Control Register 0000
H
CC13IC b FF92
H
C9
H
EX5IN Interrupt Control Register 0000
H
CC14IC b FF94
H
CA
H
EX6IN Interrupt Control Register 0000
H
CC15IC b FF96
H
CB
H
EX7IN Interrupt Control Register 0000
H
CC9IC b FF8A
H
C5
H
EX1IN Interrupt Control Register 0000
H
CP FE10
H
08
H
CPU Context Pointer Register FC00
H
CRIC b FF6A
H
B5
H
GPT2 CAPREL Interrupt Ctrl. Reg. 0000
H
CSP FE08
H
04
H
CPU Code Seg. Pointer Reg. (read only) 0000
H