HD64F2149 Datasheet, PDF (274/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

8.11 Port A
8.11.1 Overview
Port A is an 8-bit I/O port. Port A pins also function as keyboard buffer controller I/O pins
(PS2AC, PS2AD, PS2BC, PS2BD, PS2CC, PS2CD), key-sense interrupt input pins (KIN15 to
KIN8), expansion A/D converter input pins (CIN15 to CIN8), and address output pins (A23 to
A16). Port A pin functions are the same in all operating modes. Figure 8.18 shows the port A pin
configuration.
Port A
Port A pins
PA7/A23/KIN15/CIN15/PS2CD
PA6/A22/KIN14/CIN14/PS2CC
PA5/A21/KIN13/CIN13/PS2BD
PA4/A20/KIN12/CIN12/PS2BC
PA3/A19/KIN11/CIN11/PS2AD
PA2/A18/KIN10/CIN10/PS2AC
PA1/A17/KIN9/CIN9
PA0/A16/KIN8/CIN8
Pin functions in modes 1 and 2 (EXPE = 0) and mode 3
PA7 (I/O)/KIN15 (Input)/CIN15 (Input)/PS2CD (I/O)
PA6 (I/O)/KIN14 (Input)/CIN14 (Input)/PS2CC (I/O)
PA5 (I/O)/KIN13 (Input)/CIN13 (Input)/PS2BD (I/O)
PA4 (I/O)/KIN12 (Input)/CIN12 (Input)/PS2BC (I/O)
PA3 (I/O)/KIN11 (Input)/CIN11 (Input)/PS2AD (I/O)
PA2 (I/O)/KIN10 (Input)/CIN10 (Input)/PS2AC (I/O)
PA1 (I/O)/KIN9 (Input)/CIN9 (Input)
PA0 (I/O)/KIN8 (Input)/CIN8 (Input)
Pin functions in mode 2 (EXPE = 1)
PA7 (I/O)/A23 (Output)/KIN15 (Input)/CIN15 (Input)/PS2CD (I/O)
PA6 (I/O)/A22 (Output)/KIN14 (Input)/CIN14 (Input)/PS2CC (I/O)
PA5 (I/O)/A21 (Output)/KIN13 (Input)/CIN13 (Input)/PS2BD (I/O)
PA4 (I/O)/A20 (Output)/KIN12 (Input)/CIN12 (Input)/PS2BC (I/O)
PA3 (I/O)/A19 (Output)/KIN11 (Input)/CIN11 (Input)/PS2AD (I/O)
PA2 (I/O)/A18 (Output)/KIN10 (Input)/CIN10 (Input)/PS2AC (I/O)
PA1 (I/O)/A17 (Output)/KIN9 (Input)/CIN9 (Input)
PA0 (I/O)/A16 (Output)/KIN8 (Input)/CIN8 (Input)
Figure 8.18 Port A Pin Functions
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