Datasheet

Section 8 I/O Ports
Rev.7.00 Feb. 14, 2007 page 283 of 1108
REJ09B0089-0700
8.11 Port F
8.11.1 Overview
Port F is an 8-bit I/O port. Port F pins also function as bus control signal input/output pins (AS,
RD, HWR, LWR, WAIT, BREQ, BACK, BREQO, CS4, and CS5), the system clock (φ) output
pin and interrupt input pins (IRQ0 to IRQ3).
The interrupt input pins (IRQ0 to IRQ3) are Schmitt-triggered inputs.
Figure 8.23 shows the port F pin configuration.
PF7/φ
PF6/AS
PF5/RD
PF4/HWR
PF3/LWR/IRQ3
PF2/WAIT /IRQ2 /BREQO
PF1/BACK/IRQ1 /CS5
PF0/BREQ/IRQ0 /CS4
Port F
Note: * Modes 6 and 7 are not available in the ROMless versions.
PF7
(input)/φ(output)
PF6 (I/O)/AS (output)
RD (output)
HWR (output)
PF3 (I/O)/LWR (output)/IRQ3
(input)
PF2
(I/O)/WAIT (input)/IRQ2 (input)/BREQO (output)
PF1
(I/O)/BACK (output)/IRQ1(input)/CS5 (output)
PF0
(I/O)/BREQ (input)/IRQ0 (input)/CS4 (output)
Port F pins Pin functions in modes 4 to 6
*
PF7
(input)/φ (output)
PF6
(I/O)
PF5
(I/O)
PF4
(I/O)
PF3
(I/O)/IRQ3 (input)
PF2 (I/O)/IRQ2 (input)
PF1
(I/O)/IRQ1 (input)
PF0
(I/O)/IRQ0 (input)
Pin functions in mode 7
*
Figure 8.23 Port F Pin Functions