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CHAPTER 2 PIN FUNCTIONS
User’s Manual U15109EJ3V0UD
67
2.3 Description of Pin Functions
(1) P00 to P07 (port 0) ··· 3-state I/O
P00 to P07 function as an 8-bit I/O port in which input and output can be specified in 1-bit units.
In addition to I/O port pins, these pins can also be used as an NMI input, external interrupt request inputs, and
the external trigger for the A/D converter. The pin’s valid edge is specified by the EGP0 and EGN0 registers.
(a) Port function
P00 to P07 can be set to input or output in 1-bit units using the port 0 mode register (PM0).
(b) Alternate functions
(i)
NMI (non-maskable interrupt request) ··· Input
This is a non-maskable interrupt request signal input pin.
(ii)
INTP0 to INTP6 (interrupt request from peripherals) ··· Input
These are external interrupt request input pins.
(iii) ADTRG (A/D trigger input) ··· Input
This is the A/D converter’s external trigger input pin. This pin is controlled by A/D converter mode
register 1 (ADM1).