H8SLASH3028F datasheet(303/923 Pages) RENESAS

303 / 923 page

Rev. 2.00, 09/03, page 273 of 890

8.9

Port 8

8.9.1

Overview

Port 8 is a 5-bit input/output port that is also used for

3 to CS0 output, RFSH output, IRQ3 to

IRQ

0 input, and A/D converter ADTRG input. Figure 8.8 shows the pin configuration of port 8.

In modes 1 to 5 (expanded modes), port 8 can provide

3 to CS0 output, RFSH output, IRQ3 to

IRQ

0 input, and ADTRG input. See table 8.14 for the selection of pin functions in expanded

modes.

In modes 6 and 7 (single-chip modes), port 8 can provide

IRQ

3 to IRQ0 input and ADTRG input.

See table 8.15 for the selection of pin functions in single-chip mode.

See section 15, A/D Converter, for a description of the A/D converter's

ADTRG input pin.

The

IRQ

3 to IRQ0 functions are selected by IER settings, regardless of whether the pin is used for

input or output. Caution is therefore required. For details see section 5.3.1, External Interrupts.

When DRAM is connected to areas 2 to 5, the

3 and CS2 output pins function as RAS output

pins for each area. For details see section 6.5, DRAM Interface.

Pins in port 8 can drive one TTL load and a 90-pF capacitive load. They can also drive a

darlington transistor pair.

Pins P82 to P80 have Schmitt-trigger inputs.

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