HD64F3028F25 Datasheet, PDF (299/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8.7 Port 6
8.7.1 Overview
Port 6 is an 8-bit input/output port that is also used for input and output of bus control signals
(LWR, HWR, RD, AS, BACK, BREQ, WAIT) and for clock (φ) output.
In modes 1 to 5 (expanded modes), the pin functions are P6₇ (generic input)/φ, LWR, HWR, RD,
AS, P6₂/BACK, P6₁/BREQ, and P6₀/WAIT). See table 8.11 for the selection of the pin functions.
In modes 6 and 7 (single-chip modes), P6₇ functions as a generic input port or φ output, and P6₆ to
P6₀ function as generic input/output ports.
When DRAM is connected to areas 2 to 5, LWR, HWR, and RD also function as LCAS, UCAS,
and WE, respectively. For details see section 6.5, DRAM Interface.
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 ₇ / φ
P6 ₆ / LWR
P6 ₅ / HWR
P6 ₄ / RD
P6 ₃ / AS
P6 ₂ / BACK
P6 ₁ / BREQ
P6 ₀ / WAIT
Modes 1 to 5
(expanded modes)
P6₇ (input)/ φ
(output)
LWR (output)
HWR (output)
RD (output)
AS (output)
P6₂ (input/output)/ BACK (output)
P6₁ (input/output)/ BREQ (input)
P6₀ (input/output)/ WAIT (input)
Mode 6 and 7
(single-chip mode)
P6 ₇ (input) / φ(output)
P6 ₆ (input/output)
P6 ₅ (input/output)
P6 ₄ (input/output)
P6 ₃ (input/output)
P6 ₂ (input/output)
P6 ₁ (input/output)
P6 ₀ (input/output)
Figure 8.6 Port 6 Pin Configuration
Rev. 2.00, 09/03, page 267 of 890