m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 330

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
3.8 Controlling Power Using Stop Mode
Overview
Specifications
Operation
The following are steps for controlling power using stop mode. Figure 3.8.1 shows the operation
timing, Figure 3.8.2 shows an example of circuit, and Figures 3.8.3 and 3.8.4 show the set-up
procedure.
Use the following peripheral functions:
• Key-input interrupts
• Stop mode
• Pull-up function
This example is not performed USB power control. Please refer section 2.8.4 for the power
control of USB related.
(1) Use P0
(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 KI
(2) If a key is pressed, “L” is input to one of pins KI
(3) Sequentially set P0
(4) When the process to determine the key pressed is completed, change the output from P0
_____
KI
also used.
output of P0
interrupt occurs to execute the key-input interrupt handling routine.
through P0
3
) of the key-input interrupt function for the key-input reading pins. The pull-up function is
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0
through P0
3
0
to “L” again and enter stop mode.
through P0
0
3
through P0
for the scan output pins of a key matrix. Use the input pins (KI
3
to “L” and enter stop mode.
3
to “L” to determine which key was pressed.
_____
0
through KI
_____
3
to clear stop mode. A key-input
3. Controlling Power Applications
_____
0
through KI
_____
3
. Change the
_____
0
through
0