CC1010-RTR1 datasheet(23/152 Pages) TI

23 / 152 page

CC1010

SWRS047

Page 23 of 152

15.4 CPU Registers

CC1010 provides 4 register banks of 8

registers each. These register banks are

mapped in the the internal data memory

(see the Memory section on page 33) at

addresses 0x00 - 0x07, 0x08 - 0x0F, 0x10

- 0x17 and 0x18 - 0x1F. Each register

bank contains the 8 8-bit registers R0

through R7. The different register banks

are selected through the Program Status

Word PSW.RS(1:0) as shown below.

PSW also contains carry, overflow and

parity flags that reflect the current CPU

state.

In addition, the CPU uses the accumulator

ACC), B (for multiplication and division) and

the stack pointer SP. These registers are

shown below. Note that the hardware

stack pointer SP is increased when

pushing and decreased when popping

data, unlike many other microcontroller

architectures.

PSW (0xD0) - Program Status Word

Bit

Name

R/W

Reset value

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.

CY is also used for

rotation instructions.

R/W

Auxiliary carry flag. 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

Flag 0 (Available to the user for general purpose)

RS1

R/W

RS0

R/W

RS1

RS0

Working register bank and address

Bank0

0x00-0x07

Bank1

0x08-0x0F

Bank2

0x10-0x17

Bank3

0x18-0x1F

R/W

Overflow flag. Set to 1 when the last arithmetic

operation resulted in a carry (addition), borrow

(subtraction), or overflow (multiply or divide).

Otherwise, the bit cleared to 0 by all arithmetic

operations.

R/W

Flag 1 (Available to the user for general purpose)

R/W

Parity flag. Set to 1 when the modulo-2 sum of

the 8 bits in the accumulator is 1 (odd parity),

cleared to 0 on even parity.

ACC (0xE0) - Accumulator Register

Bit

Name

R/W

Reset value

Description

7:0

ACC(7:0)

R/W

0x00

Accumulator

B (0xF0) - B Register

Bit

Name

R/W

Reset value

Description

7:0

B(7:0)

R/W

0x00

B is used for multiplication and division

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