
268
Port
Description
Pins
Modes 4 and 5
Mode 6
Mode 7
Port F
8-bit I/O port
Schmitt-
triggered
input (
IRQ3,
IRQ2)
PF7/
When DDR = 0: Input port
When DDR = 1 (after reset): output
When DDR = 0
(after reset): Input
port
When DDR = 1:
output
PF6/
AS
PF5/
RD
PF4/
HWR
AS, RD, HWR output
I/O port
PF3/
LWR/IRQ3
16-bit bus mode:
LWR output
8-bit bus mode: I/O port also functioning
as interrupt input pin (
IRQ3)
I/O port also
functioning as
interrupt input pin
(
IRQ3)
PF2/
WAIT
When WAITE = 0 (after reset): I/O port
When WAITE = 1:
WAIT input
I/O port
PF1/
BACK
When BRLE = 0 (after reset): I/O port
When BRLE = 1:
BACK output
I/O port
PF0/
BREQ/IRQ2
When BRLE = 0 (after reset): I/O port
also functioning as interrupt input pin
(
IRQ2)
When BRLE = 1:
BREQ input also
functioning as interrupt input pin (
IRQ2)
I/O port also
functioning as
interrupt input pin
(
IRQ2)
Port G
5-bit I/O port
Schmitt-
triggered
PG4/
CS0
When DDR = 0*1: Input port
When DDR = 1*2:
CS0 output
I/O port also
functioning as
interrupt input pins
input (
IRQ7,
IRQ6)
PG3/
CS1
PG2/
CS2
PG1/
CS3/IRQ7
When DDR = 0 (after reset): Input port
also functioning as interrupt input pin
(
IRQ7)
When DDR = 1: Interrupt input pin
(
IRQ7) also functions as CS1, CS2,
CS3 output
(
IRQ6, IRQ7)
PG0/
IRQ6
Notes: *1 After a mode 6 reset
*2 After a mode 4 or 5 reset