Section 8 I/O Ports; Table 8.1 Port Functions - Renesas H8SX/1500 Series Hardware Manual

32-bit cisc microcomputer

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Table 8.1 summarizes the port functions. The pins of each port also have other functions such as

input/output pins of on-chip peripheral modules or external interrupt input pins. Each I/O port

includes a data direction register (DDR) that controls input/output, a data register (DR) that stores

output data, a port register (PORT) used to read the pin states, and an input buffer control register

(ICR) that controls input buffer on/off. Ports 4 and 5 do not have a DR or a DDR register.

Ports D, H, J and K have internal input pull-up MOSs and a pull-up MOS control register (PCR)

that controls the on/off state of the input pull-up MOSs.

Port 2 includes an open-drain control register (ODR) that controls on/off of the output buffer

Ports 1, 2, 3, 6, A, D, H, J, and K can drive a single TTL load and capacitive loads up to 30 pF.

All of the I/O ports can drive Darlington transistors when functioning as output ports.

Schmitt-trigger inputs are enabled when a port is used as the IRQ and TPU inputs.

Port Functions

General I/O port

also functioning

as interrupt inputs,

SCI I/Os, and A/D

converter inputs

Section 8 I/O Ports

Rev. 3.00 Mar. 14, 2006 Page 205 of 804

Section 8 I/O Ports

REJ09B0104-0300

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