HD64F2638F20J Datasheet, PDF (302/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 9 I/O Ports
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
9.6 Port A
9.6.1 Overview
Port A is a 4-bit I/O port. Port A pins also function as address bus outputs and SCI2 I/O pins
(SCK2, RxD2, and TxD2). The pin functions change according to the operating mode.
Port A has an on-chip MOS input pull-up function that can be controlled by software.
Figure 9-5 shows the port A pin configuration.
Port A
Port A pins
PA3/A19/SCK2
PA2/A18/RxD2
PA1/A17/TxD2
PA0/A16
Pin functions in modes 4 to 6
PA3 (I/O) / A19 (output) / SCK2 (I/O)
PA2 (I/O) / A18 (output) / RxD2 (input)
PA1 (I/O) / A17 (output) / TxD2 (output)
PA0 (I/O) / A16 (output)
Pin functions in mode 7
PA3 (I/O) / SCK2 (output)
PA2 (I/O) / RxD2 (input)
PA1 (I/O) / TxD2 (output)
PA0 (I/O)
Figure 9-5 Port A Pin Functions
Page 252 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010