R8C/13 Group
5.4 Voltage Detection Circuit
5.0V
V
det
V
CC
Internal reset signal(D46 bit = 1)
VC13 bit
VC27 bit
CM 10 bit
Set to "1" by program (voltage detection circuit enabled)
Interrupt acknowledged
Voltage detection
interrupt request
(D46 bit = 0)
The above applies to the following conditions.
CM10 : CM1 register bit
D4INT register D40 = 1 (voltage detection interrupt enabled)
D4INT register D41 = 1 (digital filter disabled mode)
D4INT register D47 = 1 ( Vcc is below Vdet)
VC13 : VCR1 register bit
VC27 : VCR2 register bit
D46 : D4INT register bit
Sampling time : 4 cycles of sampling clock selected in DF0 bit to DF1 bit
Figure 5.11 Operation Example of Voltage Detection Circuit to get out of Stop mode (1)
5.0V
V
det
V
CC
1
RING
x 32
f
Internal reset signal
(D46 bit = 1)
VC13 bit
VC27 bit
CM10 bit
Set to "1" by program (voltage detection circuit enabled)
Interrupt acknowledged
Voltage detection
interrupt request
(D46 bit = 0)
The above applies to the following conditions.
CM10 : CN1 register bit
VC13 : VCR1 register bit
VC27 : VCR2 register bit
D46 : D4INT register bit
D4INT register D40 bit = 1 (voltage detection interrupt enabled)
D4INT register D41 bit = 1 (use voltage detection interrupt to get out of stop mode)
D4INT register D47 bit = 0 (Vcc is over Vdet)
Sampling time : 4 cycles of sampling clock selected in DF0 bit to DF1 bit
Figure 5.12 Operation Example of Voltage Detection Circuit to get out of Stop mode (2)
Rev.1.20 Jan 27, 2006 page 25 of 205
REJ09B0111-0120
RENESAS [ RENESAS TECHNOLOGY CORP ]
