H8SLASH3021 datasheet(173/712 Pages) RENESAS

173 / 712 page

7. I/O Ports

Rev.2.00 Mar. 22, 2007 Page 149 of 684

REJ09B0352-0200

7.5.3

Pin Functions in Each Mode

The pin functions differ between mode 1, 3 (expanded modes with on-chip ROM disabled), modes

5 and 6 (expanded modes with on-chip ROM enabled), and mode 7 (single-chip mode). The pin

functions in each mode are described below.

Modes 1 and 3: Address output can be selected for each pin in port 5. Figure 7.13 shows the pin

functions in modes 1 and 3.

Port 5

(output)

Figure 7.13 Pin Functions in Modes 1 and 3 (Port 5)

Modes 5 and 6: Address output or generic input can be selected for each pin in port 5. A pin

becomes an address output pin if the corresponding P5DDR bit is set to 1, and a generic input pin

if this bit is cleared to 0. Following a reset, all pins are input pins. To use a pin for address output,

its P5DDR must be set to 1. Figure 7.14 shows the pin functions in modes 5 and 6.

Port 5

(output)

When P5DDR = 1

(input)

When P5DDR = 0

Figure 7.14 Pin Functions in Modes 5 and 6 (Port 5)

Mode 7: Input or output can be selected separately for each pin in port 5. A pin becomes an output

pin if the corresponding P5DDR bit is set to 1, and an input pin if this bit is cleared to 0. Figure

7.15 shows the pin functions in mode 7.

H8/3021 Datasheet(PDF) 173 Page - Renesas Technology Corp