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HTG12N0 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc

Part # HTG12N0
Description  4-Bit Microcontroller
PDF  30 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HTG12N0 Datasheet(HTML) 22 Page - Holtek Semiconductor Inc

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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
← 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
← 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
PC
← 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
← 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
← PC+2, if ACC=0
HTG12N0
22
18th Mar ’99



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