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MSM80C154S/83C154S
I/O control register (IOCON)
NAME
ADDRESS
IOCON
0F8H
BIT LOCATION
FLAG
IOCON.0
ALF
IOCON.1
P1HZ
IOCON.2
P2HZ
IOCON.3
P3HZ
IOCON.4
IZC
IOCON.5
SERR
IOCON.6
T32
IOCON.7
—
276
MSB
7
6
5
—
T32
SERR
If CPU power down mode (PD, HPD) is activated with this bit set to "1", the
outputs from ports 0, 1, 2, and 3 are switched to floating status.
When this bit is "0", ports 0, 1, 2, and 3 are in output mode.
Port 1 becomes a high impedance input port when this bit is "1".
Port 2 becomes a high impedance input port when this bit is "1".
Port 3 becomes a high impedance input port when this bit is "1".
The 10 k pull-up resistor for ports 1, 2, and 3 is switched off when this bit
is "1", leaving only the 100 k pull-up resistor.
Serial port reception error flag.
This flag is set to "1" if an overrun or framing error is generated when data is
received at a serial port.
The flag is reset by software.
Timer/counters 0 and 1 are connected serially to from a 32-bit timer/counter
when this bit is set to "1".
TF1 of TCON is set if a carry is generated in the 32-bit timer/counter.
Leave this bit at "0".
¡ Semiconductor
4
3
2
IZC
P3HZ
P2HZ
FUNCTION
LSB
1
0
P1HZ
ALF
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