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M16C/62P Group (M16C/62P, M16C/62PT)
6.4
Cold Start-up / Warm Start-up Determine Function
As for the cold start-up/warm start-up determine function, the WDC5 flag in the WDC register determines either
cold start-up (reset process) when power-on or warm start-up (reset process) when reset signal is applied during the
microcomputer running.
Default value of the WDC5 bit is "0" (cold start-up) when power-on. It is set to "1" (warm start-up) by writing
desired values to the WDC register. The WDC bit is not reset, regardless of a software reset or a reset operation.
Figure 6.7 shows Cold Start-up/Warm Start-up Determine Function Block Diagram. Figure 6.8 shows the Cold
Start-up/Warm Start-up Determine Function Operation Example. Figure 6.9 shows WDC Register.
Write to WDC register
Figure 6.7
Cold Start-up/Warm Start-up Determine Function Block Diagram
VCC
RESET
WDC5 Flag
NOTES:
1. The timing of which WDC5 is set is affected by how the RESET signal rises (Time lag between T1 and T2).
Figure 6.8
Cold Start-up/Warm Start-up Determine Function Operation Example
Rev.2.41
Jan 10, 2006
REJ09B0185-0241
http://www.xinpian.net
Internal power on reset
5V
0V
5V
Pch transistor ON (about 4V)
CPU reset is deasserted
0V
T1
T2
"1"
T > 100 µsec.
"0"
Program start
Reset Sequence (16MHz, about 20 µsec.)
Page 52 of 390
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WDC5 Bit
S
Q
R
Set to "1" by program
"1" is held even if
RESET becomes 0V.
6. Voltage Detection Circuit
WARM/COLD
(Cold start, warm start)
Becomes "0" on the rising
edge of VCC
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