CC1110-RTR1 datasheet(40/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 40 of 202

PSW (0xD0) – Program Status Word

Bit

Name

Reset

R/W

Description

R/W

Carry flag. Set to 1 when the last arithmetic operation resulted in a

carry (during addition) or borrow (during subtraction), otherwise

cleared to 0 by all arithmetic operations.

R/W

Auxiliary carry flag for BCD operations. Set to 1 when the last

arithmetic operation resulted in a carry into (during addition) or

borrow from (during subtraction) the high order nibble, otherwise

cleared to 0 by all arithmetic operations.

R/W

User-defined, bit-addressable

use from four possible register banks in DATA space.

Bank 0, 0x00 – 0x07

Bank 1, 0x08 – 0x0F

Bank 2, 0x10 – 0x17

4:3

RS[1:0]

R/W

Bank 3, 0x18 – 0x1F

R/W

Overflow flag, set by arithmetic operations. Set to 1 when the last

arithmetic operation resulted in a carry (addition), borrow

(subtraction), or overflow (multiply or divide). Otherwise, the bit is

cleared to 0 by all arithmetic operations.

R/W

User-defined, bit-addressable

R/W

Parity flag, parity of accumulator set by hardware to 1 if it contains

an odd number of 1’s, otherwise it is cleared to 0

12.5.3 Accumulator

ACC is the accumulator. This is the source

and destination of most arithmetic instructions,

data transfer and other instructions. The

mnemonic for the accumulator (in instructions

involving the accumulator) refers to A instead

of ACC.

ACC (0xE0) – Accumulator

Bit

Name

Reset

R/W

Description

7:0

ACC[7:0]

0x00

R/W

Accumulator

12.5.4 B Register

The B register is used as the second 8-bit

argument during execution of multiply and

divide instructions. When not used for these

purposes it may be used as a scratch-pad

B (0xF0) – B Register

Bit

Name

Reset

R/W

Description

7:0

B[7:0]

0x00

R/W

B register. Used in

MUL/DIV instructions.

12.5.5 Stack Pointer

The stack resides in DATA memory space and

grows upwards. The PUSH instruction first

increments the Stack Pointer (SP) and then

copies the byte into the stack. The Stack

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