SD6830 Datasheet, PDF (9/34 Pages) AUK corp – 4BIT MICROCONTROLLER

6.8 Registers
SD6830
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.
Bit 2
0
0
0
0
1
1
1
1
Register Z
Bit 1
0
0
1
1
0
0
1
1
Bit 0
0
1
0
1
0
1
0
1
Carrier frequency
F_SYS/12, 1/2 duty
F_SYS/12, 1/3 duty
F_SYS/12, 1/4 duty
F_SYS/8, 1/2 duty
F_SYS/8, 1/4 duty
F_SYS/11, 4/11 duty
No carrier
No carrier
KSI-W002-000
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