Hardware Configuration; Setting The Input Mode And Control Mode; Operation; Block Diagram Of Port 2 - NEC PD78212 User Manual

8-bit single-chip microcomputer sub-series

Table of Contents

µ PD78214 Sub-Series

5.3.1 Hardware Configuration

Fig. 5-6 shows the configuration of port 2

Note P20 or P21 does not have a circuit enclosed in a dotted box.

Port 2 is an input-only port.

There is no register to specify an input mode for port 2. Port 2 is always ready to receive control signals. A register

such as a control register in the hardware is used to specify what control signal to receive.

Port 2 is an input-only port, and the level of each pin of it can be read and tested.

For P20 through P27, the level from which noise has be removed can be read and tested. See Chapter 11 for

removing noise.

Fig. 5-6 Block Diagram of Port 2

Interrupt and

control signals

3-wire serial

Pull-up resistor option register

n = 0, 1, 2, ···, 6