Port 6; Overview; Register Descriptions - Hitachi H8/3032 Series Hardware Manual

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7.6 Port 6

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 7-13 shows the pin configuration of port 6. In mode 1, the pin functions are WR, RD, AS,
and P6 /WAIT. In modes 2 and 3, port 6 is a generic input/output port.
0
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 pins
P6 /
5
P6 /
4
Port 6
P6 /
3
P6 /
0
Figure 7-13 Port 6 Pin Configuration

7.6.2 Register Descriptions

Table 7-8 summarizes the registers of port 6.
Table 7-8 Port 6 Registers
Address* Name
H'FFC9 Port 6 data direction register
H'FFCB Port 6 data register
Note: * Lower 16 bits of the address.
Modes 1
WR WR
(output)
RD RD
(output)
AS AS
(output)
WAIT
P6 (input/output)/WAIT (input)
Abbreviation
P6DDR
P6DR
139
Modes 2 and 3
P6 (input/output)
5
P6 (input/output)
4
P6 (input/output)
3
P6 (input/output)
0
R/W Initial Value
W H'80
R/W H'80