Datasheet

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.