P30 To P37 (Port 3) - NEC 78014Y Series User Manual

4.2.4 P30 to P37 (Port 3)

These are 8-bit input/output ports. Beside serving as input/output ports, they function as timer input/output, clock
output and buzzer output.
The following operating modes can be specified bit-wise.
(1) Port mode
These ports function as 8-bit input/output ports. They can be specified bit-wise as input or output ports with port
mode register 3 (PM3). When they are used as input ports, an on-chip pull-up resistor can be connected with
a pull-up resistor option register (PUO).
(2) Control mode
These ports function as timer input/output, clock output, and buzzer output.
(a) TI1 and TI2
Pins for external count clock input to the 8-bit timer/event counter.
(b) TO0 to TO2
Timer output pins
(c) PCL
Clock output pin
(d) BUZ
Buzzer output pin
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CHAPTER 4 PIN FUNCTION ( µ PD78014Y Subseries)