NEC PD750008 - Manual (Page 100)

80
µPD750008 USER'S MANUAL
Table 5-3. Operations by I/O Port Manipulation Instructions
Instruction
Port and pin operation
Input mode Output mode
SKT <1> Pin data is tested. Output latch data is tested.
SKF <1>
MOV1 CY, <1> Pin data is transferred to CY. Output latch data is transferred to CY.
AND1 CY, <1> An operation is performed on pin data and An operation is performed
OR1 CY, <1> CY. on output latch data and CY.
XOR1 CY, <1>
IN A,PORTn Pin data is transferred to the accumulator. Output latch data is transferred to the
IN XA,PORTn accumulator.
MOV A,@HL
MOV XA,@HL
ADDS A,@HL An operation is performed on pin data and An operation is performed
ADDC A,@HL the accumulator. on output latch data and the accumulator.
SUBS A,@HL
SUBC A,@HL
AND
A,@HL
OR A,@HL
XOR A,@HL
SKE A,@HL Pin data is compared with the Output latch data is com-
SKE XA,@HL accumulator. pared with the accumulator.
OUT PORTn,A Accumulator data is transferred to the Accumulator data is transferred to the
OUT PORTn,XA output latch (with the output buffers kept output latch and is output on the pins.
MOV @HL,A off).
MOV @HL,XA
XCH A,PORTn Pin data is transferred to the accumulator, Data is exchanged between the output
XCH XA,PORTn and accumulator data is transferred to the latch and accumulator.
XCH A,@HL output latch (with the output buffers kept
XCH XA,@HL off).
INCS PORTn Pin data incremented by 1 is latched in Output latch data is incremented by 1.
INCS @HL the output latch.
SET1 <1> The output latch data of a specified bit is The output pin state is modified according
CLR1 <1> rewritten, but the output latch data of the to the instruction.
MOV1 <1> ,CY other bits is undefined.
SKTCLR <1>
<1> : Represents an addressing mode PORTn.bit or PORTn.@L.
*
*