HD64F3048F16 Datasheet, PDF (314/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
9.9 Port 8
9.9.1 Overview
Port 8 is a 5-bit input/output port that is also used for CS₃ to CS₀ output, RFSH output, and IRQ₃ to
IRQ₀ input. Figure 9.8 shows the pin configuration of port 8.
In modes 1 to 6 (expanded modes), port 8 can provide CS₃ to CS₀ output, RFSH output, and IRQ₃
to IRQ₀ input. See table 9.14 for the selection of pin functions in expanded modes.
In mode 7 (single-chip mode), port 8 can provide IRQ₃ to IRQ₀ input. See table 9.15 for the
selection of pin functions in single-chip mode.
The IRQ₃ to IRQ₀ functions are selected by IER settings, regardless of whether the pin is used for
input or output. For details see section 5, Interrupt Controller.
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.
Rev. 3.00 Sep 27, 2006 page 286 of 872
REJ09B0325-0300