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M16C/29 Group
5.5.2 Limitations on Exiting Stop Mode
The voltage down detection interrupt is immediately generated and the microcomputer exits stop
mode if the CM10 bit in the CM1 register is set to "1" under the conditions below.
• the VC27 bit in the VCR2 register is set to "1" (voltage down detection circuit enabled),
• the D40 bit in the D4INT register is set to "1" (voltage down detection interrupt enabled),
• the D41 bit in the D4INT register is set to "1" (voltage down detection interrupt is used to exit stop
mode), and
• the voltage applied to the VCC pin is higher than Vdet4 (the VC13 bit in the VCR1 register is "1")
If the microcomputer is set to enter stop mode when the voltage applied to the VCC pin drops below
Vdet4 and to exit stop mode when the voltage applied rises to Vdet4 or above, set the CM10 bit to "1"
when VC13 bit is "0" (VCC < Vdet4).
5.5.3 Limitations on Exiting Wait Mode
The voltage down detection interrupt is immediately generated and the microcomputer exits wait
mode If WAIT instruction is executed under the conditions below.
• the CM02 bit in the CM0 register is set to "1" (stop peripheral function clock),
• the VC27 bit in the VCR2 register is set to "1" (voltage down detection circuit enabled),
• the D40 bit in the D4INT register is set to "1" (voltage down detection interrupt enabled),
• the D41 bit in the D4INT register is set to "1" (voltage down detection interrupt is used to exit wait
mode), and
• the voltage applied to the VCC pin is higher than Vdet4 (the VC13 bit in the VCR1 register is "1")
If the microcomputer is set to enter wait mode when the voltage applied to the VCC pin drops below
Vdet4 and to exit wait mode when the voltage applied rises to Vdet4 or above, perform WAIT instruc-
tion when VC13 bit is "0" (VCC < Vdet4).
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
page 36 of 402
5. Reset
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