D12320VF25V Datasheet, PDF (287/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

8.6 Port A
Section 8 I/O Ports
8.6.1 Overview
Port A is a 4-bit I/O port. Port A pins also function as address bus outputs. The pin functions
change according to the operating mode.
Port A has a built-in MOS input pull-up function that can be controlled by software.
Figure 8.5 shows the port A pin configuration.
Port A
Port A pins
PA3/ A19
PA2/ A18
PA1/ A17
PA0/ A16
Pin functions in modes 4 and 5
A19 (output)
A18 (output)
A17 (output)
A16 (output)
Pin functions in mode 6*
PA3 (input)/A19 (output)
PA2 (input)/A18 (output)
PA1 (input)/A17 (output)
PA0 (input)/A16 (output)
Pin functions in mode 7*
PA3 (I/O)
PA2 (I/O)
PA1 (I/O)
PA0 (I/O)
Note: * Modes 6 and 7 are not available in the ROMless versions.
Figure 8.5 Port A Pin Functions
Rev.7.00 Feb. 14, 2007 page 253 of 1108
REJ09B0089-0700