D12320VF25IV Datasheet, PDF (460/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
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.
Port F
Port F pins
Pin functions in modes 4 to 6
PF₇ / φ
PF₆ / AS
PF₅ / RD
PF₄ / HWR
PF₃ / LWR
PF₂ / LCAS* / WAIT / BREQO
PF₁ / BACK
PF₀ / BREQ
PF₇ (input) / φ (output)
PF₆ (I/O) / AS (output)
RD (output)
HWR (output)
PF₃ (I/O) / LWR (output)
PF₂ (I/O) / LCAS* (output) / WAIT (input) / BREQO (output)
PF₁ (I/O) / BACK (output)
PF₀ (I/O) / BREQ (input)
Pin functions in mode 7
Note: * LCAS is not supported in the H8S/2321.
PF₇ (input) / φ (output)
PF₆ (I/O)
PF₅ (I/O)
PF₄ (I/O)
PF₃ (I/O)
PF₂ (I/O)
PF₁ (I/O)
PF₀ (I/O)
Figure 9.22 Port F Pin Functions
Rev.6.00 Sep. 27, 2007 Page 428 of 1268
REJ09B0220-0600