3069RF-ZTAT Datasheet, PDF (295/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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.
The pin configuration of port 6 is shown in figure 8.6.
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 mode 7 (single-chip mode), P6₇ functions as a generic input port or ø 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
P6₆ / LWR
P6₅ / HWR
P6 ₄ / RD
P6 ₃ / AS
P6₂ / BACK
P6₁ / BREQ
P6₀ / 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 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. 5.0, 09/04, page 273 of 978