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3069RF-ZTAT Datasheet, PDF (278/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER
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8.2 Port 1
8.2.1 Overview
Port 1 is an 8-bit input/output port also used for address output, with the pin configuration shown
in figure 8.1. The pin functions differ between the expanded modes with on-chip ROM disabled,
expanded modes with on-chip ROM enabled, and single-chip mode. In modes 1 to 4 (expanded
modes with on-chip ROM disabled), they are address bus output pins (A7 to A0).
In mode 5 (expanded mode with on-chip ROM enabled), settings in the port 1 data direction
register (P1DDR) can designate pins for address bus output (A7 to A0) or generic input. In mode 7
(single-chip mode), port 1 is a generic input/output port.
When DRAM is connected to areas 2 to 5, A7 to A0 output row and column addresses in read and
write cycles. For details see section 6.5, DRAM Interface.
Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive an LED or
a darlington transistor pair.
Port 1
Port 1 pins Modes 1 to 4 Mode 5
Mode 7
P17 /A7
P16 /A6
P15 /A5
P14 /A4
P13 /A3
P12 /A2
P11 /A1
P10 /A0
A 7 (output)
A 6 (output)
A 5 (output)
A 4 (output)
A 3 (output)
A 2 (output)
A 1 (output)
A 0 (output)
P17 (input)/A 7 (output)
P16 (input)/A 6 (output)
P15 (input)/A 5 (output)
P14 (input)/A 4 (output)
P13 (input)/A 3 (output)
P12 (input)/A 2 (output)
P11 (input)/A 1 (output)
P10 (input)/A 0 (output)
P17 (input/output)
P16 (input/output)
P15 (input/output)
P14 (input/output)
P13 (input/output)
P12 (input/output)
P11 (input/output)
P10 (input/output)
Figure 8.1 Port 1 Pin Configuration
Rev. 5.0, 09/04, page 256 of 978
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