Port 6; Overview - Renesas F-ZTAT H8 Series Hardware Manual

Section 9 I/O Ports
9.7

Port 6

9.7.1

Overview

Port 6 is a 7-bit input/output port that is also used for input and output of bus control signals
(LWR, HWR, RD, AS, BACK, BREQ, and WAIT). When DRAM is connected to area 3, LWR,
HWR, and RD also function as LW, UW, and CAS, or LCAS, UCAS, and WE, respectively. For
details see section 7, Refresh Controller.
Figure 9.6 shows the pin configuration of port 6. In modes 1 to 6 (expanded modes) the pin
functions are LWR, HWR, RD, AS, P6
method of selecting the pin states. In mode 7 (single-chip mode) port 6 is a generic input/output
port.
Pins in port 6 can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor pair.
Port 6
Rev. 7.00 Sep 21, 2005 page 278 of 878
REJ09B0259-0700
/BACK, P6
2
Port 6 pins Modes 1 to 6
(expanded modes)
LWR
P6 /
6
HWR
P6 /
5
RD
P6 /
4
AS
P6 /
3
BACK
P6 / P6 (input/output)/
2 2
BREQ
P6 / P6 (input/output)/
1 1
WAIT
P6 / P6 (input/output)/
0 0
Figure 9.6 Port 6 Pin Configuration
/BREQ, and P6 /WAIT. See table 9.11 for the
1 0
LWR
(output)
HWR
(output)
RD
(output)
AS
(output)
BACK
(output)
BREQ
(input)
WAIT
(input)
Mode 7
(single-chip mode)
P6 (input/output)
6
P6 (input/output)
5
P6 (input/output)
4
P6 (input/output)
3
P6 (input/output)
2
P6 (input/output)
1
P6 (input/output)
0