HT49C30-1 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT49C30-1' PDF : 41 Pages View PDF
RET
Description
Operation
Affected flag(s)
RET A,x
Description
Operation
Affected flag(s)
RETI
Description
Operation
Affected flag(s)
RL [m]
Description
Operation
Affected flag(s)
RLA [m]
Description
Operation
Affected flag(s)
HT49R30A-1/HT49C30-1/HT49C30L
Return from subroutine
The program counter is restored from the stack. This is a 2-cycle instruction.
PC ¬ Stack
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾¾¾¾¾¾
Return and place immediate data in the accumulator
The program counter is restored from the stack and the accumulator loaded with the speci-
fied 8-bit immediate data.
PC ¬ Stack
ACC ¬ x
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾¾¾¾¾¾
Return from interrupt
The program counter is restored from the stack, and interrupts are enabled by setting the
EMI bit. EMI is the enable master (global) interrupt bit.
PC ¬ Stack
EMI ¬ 1
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾¾¾¾¾¾
Rotate data memory left
The contents of the specified data memory are rotated 1 bit left with bit 7 rotated into bit 0.
[m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ [m].7
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾¾¾¾¾¾
Rotate data memory left and place result in the accumulator
Data in the specified data memory is rotated 1 bit left with bit 7 rotated into bit 0, leaving the
rotated result in the accumulator. The contents of the data memory remain unchanged.
ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ [m].7
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾¾¾¾¾¾
Rev. 1.10
33
September 25, 2002
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