Overview - Hitachi H8S/2678 Series Reference Manual

5.9 Port 8
5.9.1

Overview

Port 8 is a 6-bit I/O port. Port 8 pins also function as interrupt input pins (IRQ0 to IRQ5) and
EXDMAC input/output pins (EDREQ2, ETEND2, EDACK2, EDREQ3, ETEND3, and
EDACK3). The functions of pins P85 to P80 change according to the operating mode.
The interrupt input pins (IRQ0 to IRQ5) can be switched by making a setting in ITSR.
When pins P85 to P80 are used for IRQ input, they are Schmitt-trigger inputs.
Figure 5.8 shows the port 8 pin configuration.
Port 8 pins
P85 (I/O) / EDACK3 (output) / IRQ5 (input)
P84 (I/O) / EDACK2 (output) / IRQ4 (input)
P83 (I/O) / ETEND3 (output) / IRQ3 (input)
Port 8
P82 (I/O) / ETEND2 (output) / IRQ2 (input)
P81 (I/O) / EDREQ3 (input) / IRQ1 (input)
P80 (I/O) / EDREQ2 (input) / IRQ0 (input)
Modes 1, 2, 4, 5, 6, 7 (EXPE = 1)
P85 (I/O) / EDACK3 (output) / IRQ5 (input)
P84 (I/O) / EDACK2 (output) / IRQ4 (input)
P83 (I/O) / ETEND3 (output) / IRQ3 (input)
P82 (I/O) / ETEND2 (output) / IRQ2 (input)
P81 (I/O) / EDREQ3 (input) / IRQ1 (input)
P80 (I/O) / EDREQ2 (input) / IRQ0 (input)
240
Figure 5.8 Port 8 Pin Functions
Mode 7 (EXPE = 0)
P85 (I/O) / IRQ5 (input)
P84 (I/O) / IRQ4 (input)
P83 (I/O) / IRQ3 (input)
P82 (I/O) / IRQ2 (input)
P81 (I/O) / IRQ1 (input)
P80 (I/O) / IRQ0 (input)