H8SX1653 Datasheet, PDF (416/1018 Pages) Renesas Technology Corp – Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

Section 9 I/O Ports
(7) PA1/BACK/(RD/WR)
The pin function is switched as shown below according to the combination of operating mode,
EXPE bit, bus controller register, port function control register (PFCR), and the PA1DDR bit
settings.
Setting
Bus Controller
I/O Port
Module Name
Bus controller
Pin Function
BACK output *
RD/WR output *
BACK_OE
1
0
0
Byte control
SRAM
Selection

1
0
(RD/WR)_OE


1
PA1DDR



I/O port
PA1 output
0
0
0
1
PA1 input
0
0
0
0
(initial setting)
Note: * Valid in external extended mode (EXPE = 1)
(8) PA0/BREQO/BS-A
The pin function is switched as shown below according to the combination of operating mode,
EXPE bit, bus controller register, port function control register (PFCR), and the PA0DDR bit
settings.
I/O Port
Module Name Pin Function
BSA_OE
Bus controller BS-A output*
1
BREQO output* 0
I/O port
PA0 output
0
PA0 input
0
(initial setting)
Note: * Valid in external extended mode (EXPE = 1)
Setting
Bus Controller
BREQO_OE

1
0
0
I/O Port
PA0DDR


1
0
Rev.1.00 Sep. 08, 2005 Page 368 of 966
REJ09B0219-0100