Rainbow Electronics HT49R70A-1 - Manual (Page 34)

RET Return from subroutine
Description The program counter is restored from the stack. This is a 2-cycle instruction.
Operation PC ¬ Stack
Affected flag(s)
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
RET A,x Return and place immediate data in the accumulator
Description The program counter is restored from the stack and the accumulator loaded with the speci-
fied 8-bit immediate data.
Operation PC ¬ Stack
ACC ¬ x
Affected flag(s)
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
RETI Return from interrupt
Description 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.
Operation PC ¬ Stack
EMI ¬ 1
Affected flag(s)
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
RL [m] Rotate data memory left
Description The contents of the specified data memory are rotated 1 bit left with bit 7 rotated into bit 0.
Operation [m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ [m].7
Affected flag(s)
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
RLA [m] Rotate data memory left and place result in the accumulator
Description 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.
Operation ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ [m].7
Affected flag(s)
TC2 TC1 TO PD OV Z AC C
¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
HT49R70A-1
Rev. 1.00 34 December 4, 2001