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HD64F3028F25 Datasheet, PDF (282/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
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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 modes 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 modes 6
and 7 (single-chip mode), port 1 is a generic input/output port.
When DRAM is connected to area 2, 3, 4, 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
Modes 6 and 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. 2.00, 09/03, page 250 of 890
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