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HD6433044 Datasheet, PDF (259/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer
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Table 9-1 Port Functions (cont)
Port Description
Port B • 8-bit I/O port
• Can drive LEDs
• PB3 to PB0
have Schmitt
inputs
Pins
Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Mode 7
PB5/TP13/
TPC output (TP13 to TP8), ITU input and output (TOCXB4, TOCXA4,
TOCXB4,
TIOCB4, TIOCA4, TIOCB3, TIOCA3), and generic input/output
PB4/TP12/
TOCXA4,
PB3/TP11/TIOCB4,
PB2/TP10/TIOCA4,
PB1/TP9/TIOCB3,
PB0/TP8/TIOCA3
9.2 Port 1
9.2.1 Overview
Port 1 is an 8-bit input/output port with the pin configuration shown in figure 9-1. 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 modes 5 and 6 (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 mode 7 (single-chip mode), port 1 is a generic input/output port.
When DRAM is connected to area 3, A7 to A0 output row and column addresses in read and write
cycles. For details see section 7, Refresh Controller.
Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Port 1 pins Modes 1 to 4 Modes 5 and 6
Mode 7
Port 1
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 9-1 Port 1 Pin Configuration
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