12.3 Pin Functions - Renesas H8S/2633 Series Hardware Manual

10A.12.3 Pin Functions
Port F pins also function as external interrupt input pins (IRQ2 and IRQ3), BUZZ output pin, A/D
trigger input pin (ADTRG), 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 10A-21.
Table 10A-21 Port F Pin Functions
Pin Selection Method and Pin Functions
PF7/ø The pin function is switched as shown below according to bit PF7DDR.
PF7DDR
Pin function
PF6/AS/LCAS The pin function is switched as shown below according to the combination of
the operating mode and bits RMTS2 to RMTS0, LCASS, BREQOE, WAITE,
ABW5 to ABW2, and PF2DDR.
Operating
Mode
LCASS
PF6DDR
Pin function
Note: * Restricted to RMTS2 to RMTS0=B'001 to B'011, DRAM space 16-bit
PF5/RD The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
Operating
Mode
PF5DDR
Pin function
PF4/HWR The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
Operating
Mode
PF4DDR
Pin function
PF7 input pin
Modes 4 to 6
0
—
AS output pin
access in modes 4 to 6 only
Modes 4 to 6
—
RD output pin
Modes 4 to 6
—
HWR output pin
0
1*
—
LCAS
PF6 input pin PF6 output pin
output pin
0
PF5 input pin
0
PF4 input pin
1
ø output pin
Mode 7
—
0 1
Mode 7
1
PF5 output pin
Mode 7
1
PF4 output pin
429