SH7263 Datasheet, PDF (1553/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 30 I/O Ports
Section 30 I/O Ports
This LSI has six ports: A to F.
All port pins are multiplexed with other pin functions. The functions of the multiplex pins are
selected by means of the pin function controller (PFC).
Each port is provided with data registers for storing the pin data and port registers for reading the
states of the pins.
30.1 Features
1. Total port number: 99 ports (I/O: 82 ports, Input: 16 ports, Output: 1 ports)
• Port A: (Input: 8 ports)
• Port B: (I/O: 4 ports, Input: 8 ports, Output: 1 port)
• Port C: (I/O: 15 ports)
• Port D: (I/O: 16 ports)
• Port E: (I/O: 16 ports)
• Port F: (I/O: 31 ports)
2. The following pins in this LSI have weak keeper circuits that prevent the pins from floating
into intermediate voltage levels.
• Port B: PB8 to PB12
• Port C: PC0 to PC14
• Port D: PD0 to PD15
• Port E: PE0 to PE15
• Port F: PF0 to PF30
The I/O pins include weak keeper circuits that fix the input level high or low when the I/O pins are
not driven from outside. Generally in the CMOS products, input levels in unused input pins must
be fixed by way of external pull-up or pull-down resistors. However, the I/O pins having weak
keeper circuits in this LSI can eliminate these outer circuits and reduce parts number of the
system. If the pull-up or pull-down resistors become necessary to fix the pin level, use the resistor
of 10 kΩ or smaller.
Rev. 2.00 Mar. 14, 2008 Page 1519 of 1824
REJ09B0290-0200