M30620FCAFP datasheet(529/615 Pages) RENESAS

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Controlling Power Applications

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-212

3.7 Controlling Power Using Stop Mode

The following are steps for controlling power using stop mode. Figure 3.7.1 shows the operation

timing, Figure 3.7.2 shows an example of circuit, and Figures 3.7.3 and 3.7.4 show the set-up

procedure.

Use the following peripheral functions:

• Key-input interrupts

• Stop mode

• Pull-up function

_____

(1) Use P100 through P103 for the scan output pins of a key matrix. Use the input pins (KI0

_____

through KI3) of the key-input interrupt function for the key-input reading pins. The pull-up

function is also used.

(2) If a key-input interrupt request occurs, clear the stop mode and read a key.

_____

(1) Enable a key-input interrupt and set the pull-up function to pins KI0 through KI3. Change the

output of P100 through P103 to “L” and enter stop mode.

_____

(2) If a key is pressed, “L” is input to one of pins KI0 through KI3 to clear stop mode. A key-input

interrupt occurs to execute the key-input interrupt handling routine.

(3) Sequentially set P100 through P103 to “L” to determine which key was pressed.

(4) When the process to determine the key pressed is completed, change the output from P100

through P103 to “L” again and enter stop mode.

Figure 3.7.1. Operation timing of controlling power using stop mode

P100 output

P101 output

P102 output

P103 output

P104 to P107 input

Key input

Key OFF

Key ON

Stop mode

Key input

interrupt processing

CPU clock

Stop mode

Key matrix scan

(1) Shift to stop mode

(2) Cancel a stop mode

(3) Key scan

(4) Shift to stop mode

Key ON

Overview

Specifications

Operation

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