Port F; Overview - Hitachi H8S/2646 Hardware Manual

9.13

Port F

9.13.1

Overview

Port F is a 7-bit I/O port. Port F also functions as LCD driver output pins (SEG20 to SEG17),
external interrupt input pins (IRQ2, IRQ3), the A/D trigger input pin (ADTRG), bus control signal
I/O pins (AS, RD, HWR, LWR, WAIT), and as the system clock output pin (φ).
Figure 9-12 shows the port F pin configuration.
Port F pins
PF7 / ø
PF6 / AS / SEG20 / SEG36 *
PF5 / RD / SEG19 / SEG35 *
PF4 / HWR / SEG18 / SEG34 *
Port F
PF3 / LWR / ADTRG / IRQ3
PF2 / WAIT / SEG17 / SEG33 *
PF0 / IRQ2
Note: * In the H8S/2648, H8S/2648R, and H8S/2647.
Pin functions in modes 4 to 6
PF7 (input) / ø (output)
PF6 (I/O) / AS (output) / SEG20 (output) / SEG36 * (output)
PF5 (I/O) / RD (output) / SEG19 (output) / SEG35 * (output)
PF4 (I/O) / HWR (output) / SEG18 (output) / SEG34 * (output)
PF3 (I/O) / LWR (output) / ADTRG (input) / IRQ3 (input)
PF2 (I/O) / WAIT (input) / SEG17 (output) / SEG33 * (output)
PF0 (I/O) / IRQ2 (input)
Pin functions in mode 7
PF7 (I/O) / ø (output)
PF6 (I/O) / SEG20 (output) / SEG36 * (output)
PF5 (I/O) / SEG19 (output)) / SEG35 * (output)
PF4 (I/O) / SEG18 (output)) / SEG34 * (output)
PF3 (I/O) / ADTRG (input) / IRQ3 (input)
PF2 (I/O) / SEG17 (output)) / SEG33 * (output)
PF0 (I/O) / IRQ2 (input)
Figure 9-12 Port F Pin Functions
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