HD6413008VF25 Datasheet, PDF (187/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 7 I/O Ports
7. I/O Ports
7.1 Overview
The H8/3008 has six input/output ports (ports 4, 6, 8, 9, A, and B) and one input-only port (port
7). Table 7.1 summarizes the port functions. The pins in each port are multiplexed as shown in
table 7.1.
Each port has a data direction register (DDR) for selecting input or output, and a data register
(DR) for storing output data. In addition to these registers, port 4 has an input pull-up MOS
control register (PCR) for switching input pull-up MOS transistors on and off.
Ports 4, 6, and 8 can drive one TTL load and a 90-pF capacitive load. Ports 9, A, and B can drive
one TTL load and a 30-pF capacitive load. Ports 4, 6, 8, 9, A, and B can drive a darlington pair.
Pins P8₂ to P8₀, PA₇ to PA₀ have Schmitt-trigger input circuits.
For block diagrams of the ports see appendix C, I/O Port Block Diagrams.
Table 7.1 Port Functions
Port Description
Port 4 • 8-bit I/O port
• Built-in input
pull-up MOS
Port 6 • 8-bit I/O port
Port 7 • 8-bit I/O port
Pins
P4₇ to P4₀/D₇ to D₀
P6₇/φ
P6₆/LWR
P6₅/HWR
P6₄/RD
P6₃/AS
P6₂/BACK
P6₁/BREQ
P6₀/WAIT
P7₇/AN₇/DA₁
P7₆/AN₆/DA₀
P7₅ to P7₀/
AN₅ to AN₀
Expanded Modes
Mode 1
Mode 2
Mode 3
Mode 4
Data input/output (D₇ to D₀) and 8-bit generic input/output
8-bit bus mode: generic input/output
16-bit bus mode: data input/output
Clock output (φ) and generic input
Bus control signal output (LWR, HWR, RD, AS)
Bus control signal input/output (BACK, BREQ, WAIT) and 3-
bit generic input/output
Analog input (AN₇, AN₆) to A/D converter, analog output
(DA₁, DA₀) from D/A converter, and generic input
Analog input (AN₅ to AN₀) to A/D converter, and generic
input
Rev.4.00 Aug. 20, 2007 Page 141 of 638
REJ09B0395-0400