HTG12N0 datasheet(22/30 Pages) HOLTEK

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INC [R3R2]

Increment data memory

Machine Code

0 0 0 0 1 1 1 0

Description

Data memory specified by the register pair “R3,R2” is incremented by one.

Carry flag is not affected.

Operation

M(R3,R2)

← M(R3,R2)+1

JAn address

Jump if accumulator Bit n is set

Machine Code

1 0 0 n n a a a

a a a a a a a a

Description

Bits 0~10 of the program counter are replaced with the directly–specified

address, bit 11 of the program counter and PA3 of the memory bank re-

main, if the accumulator bit n is set to one.

Operation

PC (bit 0–10)

← address, if ACC bit n=1(n=0,1,2,3,)

← PC+2, if ACC bit n=0

JC address

Jump if carry is set

Machine Code

1 1 0 0 0 a a a

a a a a a a a a

Description

Bits 0~10 of the program counter are replaced with the directly–specified

address, bit 11 of the program counter and PA3 of the memory bank re-

main, if the C (Carry flag) is set to one.

Operation

PC (bit 0~10)

← address, if C=1

← PC+2, if C=0

JMP address

Direct Jump

Machine Code

1 1 1 0 a a a a

a a a a a a a a

Description

Bits 0~11 of the program counter are replaced with the directly–specified

address.

Operation

← address

JNC address

Jump if carry is not set

Machine Code

1 1 0 0 1 a a a

a a a a a a a a

Description

Bits 0~10 of the program counter are replaced with the directly–specified

address, bit 11 of the program counter and PA3 of the memory bank re-

main, if the C (Carry flag) is set to zero.

Operation

PC (bit 0~10)

← address, if C=0

← PC+2, if C=1

JNZ A,address

Jump if accumulator is not zero

Machine Code

1 0 1 1 1 a a a

a a a a a a a a

Description

Bits 0~10 of the program counter are replaced with the directly–specified

address, bit 11 of the program counter and PA3 of the memory bank re-

main, if the accumulator is not zero.

Operation

PC (bit 0~10)

← address, if ACC≠0

← PC+2, if ACC=0

HTG12N0

18th Mar ’99

HTG12N0 Scheda tecnica(PDF) 22 Page - Holtek Semiconductor Inc

HTG12N0 Scheda tecnica(HTML) 22 Page - Holtek Semiconductor Inc

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