Datasheet

Section 9 I/O Ports
Rev.6.00 Sep. 27, 2007 Page 428 of 1268
REJ09B0220-0600
9.13 Port F
9.13.1 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, LCAS
*
, WAIT, BREQO, BREQ, and BACK) and the system clock (φ) output
pin. The AS, LWR, and BREQO output pins can be switched by means of settings in PFCR2 and
SYSCR.
Figure 9.22 shows the port F pin configuration.
Note: * LCAS is not supported in the H8S/2321.
PF
7
/ φ
PF
6
/ AS
PF
5
/ RD
PF
4
/ HWR
PF
3
/ LWR
PF
2
/ LCAS
*
/ WAIT / BREQO
PF
1
/ BACK
PF
0
/ BREQ
Port F
Port F pins
PF
7
(input) / φ (output)
PF
6
(I/O)
PF
5
(I/O)
PF
4
(I/O)
PF
3
(I/O)
PF
2
(I/O)
PF
1
(I/O)
PF
0
(I/O)
Pin functions in mode 7
PF
7
(input) / φ (output)
PF
6
(I/O) / AS (output)
RD (output)
HWR (output)
PF
3
(I/O) / LWR (output)
PF
2
(I/O) / LCAS
*
(output) / WAIT (input) / BREQO (output)
PF
1
(I/O) / BACK (output)
PF
0
(I/O) / BREQ (input)
Pin functions in modes 4 to 6
Note: * LCAS is not supported in the H8S/2321.
Figure 9.22 Port F Pin Functions