KSI-W002-000

9

6.8

Registers

Register A

Register A, called the accumulator, plays a central role, is used to store an input or an

output operand (result) in the execution of most instructions. It consists of 4-bit.

Register B

Register B is used to store a temporary data in CPU. It consists of 4-bit.

Register H

Register H is used to indicate an address of the data memory in conjunction with register L.

It consists of 1-bit, which is related with the bit 0 of accumulator

Register L

Register L is used to indicate an address of the data memory in conjunction with register H,

Also lower 3-bit can be used to indicate the bit position of the port F. It consists of 4-bit

Register Z

Register Z is used to select a carrier frequency. The carrier frequency must be selected

before Port C data write operation. It consists of 3-bit.

Register Z

Bit 2

Bit 1

Bit 0

Carrier frequency

0

0

0

F

0

0

1

F

0

1

0

F

0

1

1

F

1

0

0

F

1

0

1

F

1

1

0

No carrier

1

1

1

No carrier

SD6830