Renesas H8S/2318 series, Hardware Manual

Page: 314 / 1121

Rev. 5.00, 12/03, page 284 of 1088
8.11.3 Pin Functions
Port F pins also function as bus control signal input/output pins (
AS
,
RD
,
HWR
,
LWR
,
WAIT
,
BREQ
,
BACK
,
BREQO
,
CS4
, and
CS5
) the system clock (
φ
) output pin and interrupt input pins
(
IRQ0
to
IRQ3
). The pin functions differ between modes 4 to 6*
1
, and mode 7*
1
. Port F pin
functions are shown in table 8-20.
Table 8-20 Port F Pin Functions
Pin Selection Method and Pin Functions
PF7/
φ
The pin function is switched as shown below according to bit PF7DDR.
PF7DDR 0 1
Pin function PF7 input pin
φ
output pin
PF6/
AS
The pin function is switched as shown below according to the operating mode,
and bit PF6DDR, and bit ASOD in PFCR2.
Operating
Mode Modes
4 to 6
*
1
Mode 7
*
1
ASOD 0 1 —
PF6DDR — 0 1 0 1
Pin function
AS
output
pin
PF6 input
pin
PF6 output
pin
PF6 input
pin
PF6 output
pin
PF5/
RD
The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
Operating
Mode Modes
4 to 6
*
1
Mode 7
*
1
PF5DDR — 0 1
Pin function
RD
output pin PF5 input pin PF5 output pin
PF4/
HWR
The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
Operating
Mode Modes
4 to 6
*
1
Mode 7
*
1
PF4DDR — 0 1
Pin function
HWR
output pin PF4 input pin PF4 output pin