Rev.6.00 Oct.28.2004 page 330
of 1016
REJ09B0138-0600H
9.13.3
Pin Functions
Port F pins also function as bus control signal input/output pins (
AS
,
RD
,
HWR
,
LWR
,
LCAS
,
WAIT
,
BREQO
,
BREQ
,
and
BACK
) and the system clock (ø) output pin. The pin functions differ between modes 4 to 6, and mode 7. Port F pin
functions are shown in table 9-24.
Table 9-24 Port F Pin Functions
Pin
Selection Method and Pin Functions
PF
7
/ø
The pin function is switched as shown below according to bit PF7DDR.
PF7DDR
0
1
Pin function
PF
7
input pin
ø output pin
PF
6
/
AS
The pin function is switched as shown below according to the operating mode
and bit PF6DDR.
Operating
Mode
Modes 4 to 6
*
Mode 7
*
PF6DDR
—
0
1
Pin function
AS
output pin
PF
6
input pin
PF
6
output pin
Note:
*
Modes 6 and 7 are provided in the on-chip ROM version only.
PF
5
/
RD
The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
Operating
Mode
Modes 4 to 6
*
Mode 7
*
PF5DDR
—
0
1
Pin function
RD
output pin
PF
5
input pin
PF
5
output pin
Note:
*
Modes 6 and 7 are provided in the on-chip ROM version only.
PF
4
/
HWR
The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
Operating
Mode
Modes 4 to 6
*
Mode 7
*
PF4DDR
—
0
1
Pin function
HWR
output pin
PF
4
input pin
PF
4
output pin
Note:
*
Modes 6 and 7 are provided in the on-chip ROM version only.
PF
3
/
LWR
The pin function is switched as shown below according to the operating mode
and bit PF3DDR.
Operating
Mode
Modes 4 to 6
*
Mode 7
*
PF3DDR
—
0
1
Pin function
LWR
output pin
PF
3
input pin
PF
3
output pin
Note:
*
Modes 6 and 7 are provided in the on-chip ROM version only.
Summary of Contents for ZTAT H8S/2357F
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