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8.11.3
Pin Functions
Port F pins also function as bus control signal input/output pins (
AS
,
RD
,
HWR
,
LWR
,
WAIT
,
BREQ
, and
BACK
) the system clock () output pin and interrupt input pins (
IRQ0
to
IRQ3
). The
pin functions differ between modes 1, 2, 4, 5, and 6*, and modes 3 and 7*. Port F pin functions are
shown in table 8.20.
Table 8.20
Port F Pin Functions
Pin
Selection Method and Pin Functions
PF
7
/
The pin function is switched as shown below according to bit PF7DDR.
PF7DDR
0
1
Pin function
PF
7
input pin
output pin
PF
6
/
AS
The pin function is switched as shown below according to the operating mode
and bit PF6DDR.
Operating
Mode
Modes
1, 2, 4, 5, 6
*
Modes 3 and 7
*
PF6DDR
—
0
1
Pin function
Note:
*
Modes 1 to 3 are not available on the F-ZTAT version.
Modes 2, 3, 6, and 7 are not available on the ROMless version.
The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
AS
output pin
PF
6
input pin
PF
6
output pin
PF
5
/
RD
Operating
Mode
Modes
1, 2, 4, 5, 6
*
Modes 3 and 7
*
PF5DDR
—
0
1
Pin function
Note:
*
RD
output pin
PF
5
input pin
PF
5
output pin
Modes 1 to 3 are not available on the F-ZTAT version.
Modes 2, 3, 6, and 7 are not available on the ROMless version.
The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
PF
4
/
HWR
Operating
Mode
Modes
1, 2, 4, 5, 6
*
Modes 3 and 7
*
PF4DDR
—
0
1
Pin function
Note:
*
HWR
output pin
PF
4
input pin
PF
4
output pin
Modes 1 to 3 are not available on the F-ZTAT version.
Modes 2, 3, 6, and 7 are not available on the ROMless version.