NEC PD750008 - Manual (Page 314)

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µPD750008 USER'S MANUAL
DI IExxx
Function: IExxx <– 0 xxx = N
5
, N
2-0
Resets an interrupt enable flag (IExxx) to 0 to disable an interrupt. (xxx = BT, CSI, T0, T1, W, 0, 1, 2, 4)
11.4.13 I/O Instructions
IN A,PORTn
Function: A <– PORTn n = N
3-0
: 0–8
Transfers the contents of the port specified by PORTn (n = 0-8) to the A register.
Caution Before this instruction can be executed, MBE = 0 or (MBE = 1, MBS = 15) must be set. A
number from 0 to 8 can be specified as n. Depending on I/O mode specification, output
latch data (in the output mode) or pin data (in the input mode) are transferred.
IN XA,PORTn
Function: A <– PORTn, X <– PORT
n+1
n = N
3-0
: 4, 6
Transfers the contents of the port specified by PORTn (n = 4 or 6) to the A register, then transfers the
contents of the next port to the X register.
Caution Only the number 4 or 6 can be specified as n. Before this instruction can be executed,
MBE = 0 or (MBE = 1, MBS = 15) must be set. Depending on I/O mode specification, output
latch data (in the output mode) or pin data (in the input mode) are transferred.
OUT PORTn, A
Function: PORTn <– A n = N
3-0
: 2–8
Transfers the contents of the A register to the output latch of the port specified by PORTn (n = 2–8).
Caution Before this instruction can be executed, MBE = 0 or (MBE = 1, MBS = 15) must be set.
A number from 2 to 8 can be specified as n.
OUT PORTn, XA
Function: PORTn <– A, PORT
n+1
<– X n = N
3-0
: 4, 6
Transfers the contents of the A register to the output latch of the port specified by PORTn (n = 4, 6), then
transfers the contents of the X register to the output latch of the next port.