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HT9480 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

Part # HT9480
Description  8-Bit Numerical Pager Controller MCU
PDF  47 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9480 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc

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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
¾¾¾¾¾¾
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
¾¾¾¾¾¾
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
¾¾¾¾¾¾
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
¾¾¾¾¾¾
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
¾¾¾¾¾¾
HT9480
Rev. 1.20
39
July 31, 2002



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