SH7763 Datasheet, PDF (1824/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 40 General Purpose I/O (GPIO)
40.3 Usage Examples
Example procedures for configuring general-purpose input/output ports (GPIO) are shown below.
40.3.1 Port Output Function
To set up a pin for the port output function, write B'01 to the corresponding two bits in the port
control register (PACR to PPCR). This allows the data of the corresponding bit in the port data
register (PADR to PPDR) to be output from that pin.
Note that settings in the pull-up control register (PAPUPR to PPPUPR) and pin select register
(PSEL0 to PSEL4) are invalid for the pins configured for the port output function.
40.3.2 Port Input Function
To set up a pin for the port input function, write B'10 (when not using MOS pull-up) or B'11
(when using MOS pull-up) to the corresponding two bits in the port control register (PACR to
PPCR). This allows the value of that pin to be read from the corresponding bit in the port data
register (PADR to PPDR).
Note that settings in the pull-up control register (PAPUPR to PPPUPR) and pin select register
(PSEL0 to PSEL4) are invalid for the pins configured for the port output function.
40.3.3 Peripheral Module Function
To set up a pin for use by peripheral modules, first set the pin select register (PSEL0 to PSEL4) to
select the module that uses that pin.
Then, if the pin is to be used as an input or input/output pin, set the pull-up control register
(PAPUPR to PPPUPR) to create the MOS pull-up setting: to the corresponding bit, write 0 when
not using the MOS pull-up or write 1 when using the MOS pull-up. For a pin used for output, the
MOS pull-up is always turned off for any setting of the pull-up control register.
Finally, write B'00 to the corresponding two bits in the port control register (PACR to PPCR).
Rev. 1.00 Oct. 01, 2007 Page 1758 of 1956
REJ09B0256-0100