Hitachi H8S/2633 Hardware Manual page 416

10.12 Port F
10.12.1 Overview
Port F is an 8-bit I/O port. 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.
Figure 10-22 shows the port F pin configuration.
Port F pins
PF7/ ø
PF6 /AS/ LCAS
PF5 /RD
PF4 /HWR
Port F
PF3 /LWR/ADTRG/IRQ3
PF2 /WAIT /BREQO
PF1 /BACK/ BUZZ
PF0 /BREQ/IRQ2
392
Pin functions in modes 4 to 6
PF7 (input) / ø (output)
AS (output) / LCAS (output)
RD (output)
HWR (output)
PF3 (I/O) / LWR (output) / ADTRG (input) / IRQ3 (input)
PF2 (I/O) / LCAS (output) / WAIT (input) / BREQO (output)
PF1 (I/O) / BACK (output) / BUZZ (output)
PF0 (I/O) / BREQ (input) / IRQ2 (input)
Pin functions in mode 7
PF7 (input) / ø (output)
PF6 (I/O)
PF5 (I/O)
PF4 (I/O)
(I/O) / ADTRG (input) / IRQ3 (input)
PF3
PF2 (I/O)
PF1 (I/O) / BUZZ (output)
(I/O) / IRQ2 (input)
PF0
Figure 10-22 Port F Pin Functions