P70 To P72 (Port 7); P100 To P101 (Port 10) - NEC PD78081(A) User Manual

2.2.5 P70 to P72 (Port 7)

This is a 3-bit input/output port. In addition to its use as an input/output port, it also has serial interface data input/
output and clock input/output functions.
The following operating modes can be specified bit-wise.
(1) Port mode
Port 7 functions as a 3-bit input/output port. Bit-wise specification as an input port or output port is possible
by means of port mode register 7 (PM7). When used as input ports, on-chip pull-up resistors can be used
by defining the pull-up resistor option register L (PUOL).
(2) Control mode
Port 7 functions as serial interface data input/output and clock input/output.
(a) SI2, SO2
Serial interface serial data input/output pins
(b) SCK2
Serial interface serial clock input/output pin.
(c) RxD, TxD
Asynchronous serial interface serial data input/output pins.
(d) ASCK
Asynchronous serial interface serial clock input pin.
Caution When this port is used as a serial interface, the I/O and output latches must be set according
to the function the user requires.
For the setting, see the operation mode setting list in Table 11-2 "Serial Interface Channel
2 Operating Mode Settings"

2.2.6 P100 to P101 (Port 10)

These are 2-bit input/output ports. Besides serving as input/output ports, they function as timer input/output.
The following operating modes can be specified bit-wise.
(1) Port mode
These ports function as 2-bit input/output ports. They can be specified bit-wise as input or output ports with
port mode register 10 (PM10). When they are used as input ports, on-chip pull-up resistors can be used by
defining the pull-up resistor option register H (PUOH).
(2) Control mode
These ports function as timer input/output.
(a) TI5, TI6
Pin for external clock input to the 8-bit timer/event counter 5 and 6.
(b) TO5, TO6
Timer output pins.
CHAPTER 2 PIN FUNCTION
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