H8S-2643 Datasheet, PDF (477/1277 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer

10.15 Port F
Section 10 I/O Ports
10.15.1 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 (φ)
output pin.
Figure 10.25 shows the port F pin configuration.
Port F
Port F pins
Pin functions in modes 4 to 6
PF7 / φ
PF6 / AS/ L C AS
PF5 / RD
PF4 / HWR
PF3 / LWR/ADTRG/IRQ3
PF2 / LCAS/ WAIT / BREQO
PF1 / BACK/ BUZZ
PF0 / BREQ/IRQ2
PF7 (input) / φ (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) / φ (output)
PF6 (I/O)
PF5 (I/O)
PF4 (I/O)
PF3 (I/O) / ADTRG (input) / IRQ3 (input)
PF2 (I/O)
PF1 (I/O) / BUZZ (output)
PF0 (I/O) / IRQ2 (input)
Figure 10.25 Port F Pin Functions
Rev. 3.00 Jan 11, 2005 page 423 of 1220
REJ09B0186-0300O