R8C/13 Group
5.4 Voltage Detection Circuit
5.4 Voltage Detection Circuit
The voltage detection circuit monitors the input voltage at the VCC pin with respect to Vdet. The user
program can check for voltage detection using the VC13 bit or set up the voltage detection interrupt
register to generate a hardware reset 2 or voltage detection interrupt.
Figure 5.7 shows the voltage detection circuit. Figure 5.8 shows VCR1 and VCR2 registers. Figure 5.9
shows the D4INT register. Figure 5.10 shows an operation example of the voltage detection circuit. Fig-
ure 5.11 to 5.12 show the operation example of the voltage detection circuit to get out of stop mode.
VC27
V
CC
+
-
Voltage detection
interrupt signal
Noise canceller
VCR1 register
b3
Internal
reference
voltage
VC13 bit
Figure 5.7 Voltage Detection Circuit Block
Rev.1.20 Jan 27, 2006 page 21 of 205
REJ09B0111-0120
RENESAS [ RENESAS TECHNOLOGY CORP ]
