HD64F2168 Datasheet, PDF (266/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

8.10 Port A
Port A is an 8-bit I/O port. Port A pins also function as the address output, event counter input,
keyboard input, and SCI_0 and SCI_2 external control pins. Pin functions are switched depending
on the operating mode. Port A has the following registers. PADDR and PAPIN have the same
address.
• Port A data direction register (PADDR)
• Port A output data register (PAODR)
• Port A input data register (PAPIN)
8.10.1 Port A Data Direction Register (PADDR)
The individual bits of PADDR specify input or output for the pins of port A.
Bit Bit Name Initial Value R/W Description
7
PA7DDR 0
W In normal extended mode:
6
PA6DDR 0
5
PA5DDR 0
4
PA4DDR 0
3
PA3DDR 0
2
PA2DDR 0
1
PA1DDR 0
0
PA0DDR 0
W The corresponding port A pins are address output
W
ports when the PADDR bits are set to 1, and input
ports when cleared to 0. Pins function as the address
W _{output port depending on the setting of bits IOSE,}
W ^{CS256E, CPCSE, ADFULLE in bus controller.}
W ^{In other mode:}
W ^{The corresponding port A pins are output ports when}
the PADDR bits are set to 1, and input ports when
W _{cleared to 0.}
Rev. 3.00, 03/04, page 226 of 830