CC2430 Datasheet, PDF (47/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
PSW (0xD0) – Program Status Word
Bit Name
7 _CY
6 _AC
5 _F0
4:3 _RS[1:0]
2 _OV
1 _F1
0_P
Reset R/W
0
R/W
0
R/W
0
R/W
00
R/W
0
R/W
0
R/W
0
R/W
Description
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.
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.
User-defined, bit-addressable
Register bank select bits. Selects which set of R7-R0 registers to
use from four possible register banks in DATA space.
00 Bank 0, 0x00 – 0x07
01 Bank 1, 0x08 – 0x0F
10 Bank 2, 0x10 – 0x17
11 Bank 3, 0x18 – 0x1F
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.
User-defined, bit-addressable
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 transfers and other instructions. The
mnemonic for the accumulator (in instructions
involving the accumulator) refers to A instead
of ACC.
ACC (0xE0) – Accumulator
Bit Name
7:0 ACC[7:0]
Reset R/W Description
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
register to hold temporary data.
B (0xF0) – B Register
Bit Name
7:0 B[7:0]
Reset R/W Description
0x00 R/W _{B register. Used in MUL/DIV instructions.}
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 47 of 232