Renesas H8S/2318 series, Hardware Manual

Page: 248 / 1121

Rev. 5.00, 12/03, page 218 of 1088
Port Description Pins
Mode
4
Mode
5
Mode
6
* 1
Mode
7
* 1
Port E • 8-bit I/O port
• Built-in MOS
input pull-up
PE7/D7 to PE0/D0 In 8-bit bus mode: I/O port
In 16-bit bus mode: data bus input/output
I/O port
Port F • 8-bit I/O port
• Schmitt-
triggered input
(
IRQ3
to
IRQ0
)
PF7/
φ
When DDR = 0: input port
When DDR = 1 (after reset):
φ
output
When DDR =
0 (after
reset): input
port
When DDR =
1:
φ
output
PF6/
AS
When ASOD = 1: I/O port
When ASOD = 0:
AS
output
I/O port
PF5/
RD
PF4/
HWR
RD
,
HWR
output
PF3/
LWR
/
IRQ3
In 8-bit bus mode: When LWROD = 1, I/O
port
In 16-bit bus mode:
LWR
output also
functioning as interrupt input pin (
IRQ3
)
I/O port also
functioning
as interrupt
input pins
(
IRQ3
to
IRQ0
)
PF2/
WAIT
/
IRQ2
/
BREQO
When WAITE = 0, BRLE = 0, BREQOE =
0 (after reset): I/O port also functioning as
interrupt input pin (
IRQ2
)
When WAITE = 1:
WAIT
input also
functioning as interrupt input pin (
IRQ2
)
When WAITE = 0, BRLE = 1, BREQOE =
1:
BREQO
output also functioning as
interrupt input pin (
IRQ2
)
PF1/
BACK
/
IRQ1
/
CS5
PF0/
BREQ
/
IRQ0
/
CS4
When BRLE = 0 (after reset): I/O port also
functioning as interrupt input pins (
IRQ1
,
IRQ0
)
When CS25E = 1, PF1CS5S = 1, and
DDR = 1: Also functions as
CS5
output
When CS25E = 1, PF0CS4S = 1, and
DDR = 1: Also functions as
CS4
output
When BRLE = 1:
BREQ
input,
BACK
output also functioning as interrupt input
pins (
IRQ1
,
IRQ0
)