H8-3039 Datasheet, PDF (179/708 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer

7.6 Port 6
Section 7 I/O Ports
7.6.1 Overview
Port 6 is a 4-bit input/output port that is also used for input and output of bus control signals (WR,
RD, AS, and WAIT).
Figure 7.16 shows the pin configuration of port 6. In modes 1, 3 and 5, the pin functions are WR,
RD, AS, and P6₀/WAIT. In modes 6 and 7, port 6 is a generic input/output port.
Pins in port 6 can drive one TTL load and a 90-pF capacitive load. They can also drive a
Darlington transistor pair.
Port 6
Port 6 pins
P6 ₅ / WR
P6 ₄ / RD
P6 ₃ / AS
P6 ₀ / WAIT
Modes 1, 3 and 5
WR (output)
RD (output)
AS (output)
P6₀ (input/output)/WAIT (input)
Modes 6 and 7
P6 ₅ (input/output)
P6 ₄ (input/output)
P6 ₃ (input/output)
P6 ₀ (input/output)
Figure 7.16 Port 6 Pin Configuration
Rev.3.00 Mar. 26, 2007 Page 157 of 682
REJ09B0353-0300