r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 73

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 6.4
Voltage detection 2 circuit
LVCMP2
VCC
Internal reference voltage
Watchdog timer block
change
Level
VCA24 = 1
VW2C0 to VW2C3, VW2F0, VW2F1, VW2C6, VW2C7: Bits in VW2C
VCA13: Bit in VCA1 register
VCA23, VCA24, VCA27: Bits in VCA2 register
COMPSEL, IRQ2SEL: Bits in CMPA register
VCAC2: Bit in VCAC register
VCA24 = 0
VCA23 = 0
Block Diagram of Voltage Monitor 2 Interrupt Generation Circuit
When VCA27 bit is set to 0 (disabled),
voltage detection 2 signal is driven high.
VCA27
Watchdog timer underflow signal
+
-
Voltage
detection 2
signal
fOCO-S
VCA13
Voltage monitor 2 interrupt generation circuit
VW2C3
VW2C1 = 0
VW2C1 = 1
VW2C3 bit is set to 0 (not detected)
by writing 0 by a program.
1/2
1/2
VW2F1 to VW2F0
1/2
= 00b
= 01b
= 10b
= 11b
Digital filter
VW2C2 bit is set to 0 (not detected) by writing 0 by a program.
When VCA27 bit is set to 0 (voltage detection 2 circuit disabled),
VW2C2 bit is set to 0.
VCAC2
VW2C6
selection
circuit
Edge
VW2C2
COMPSEL
VW2C0
IRQ2SEL
6. Voltage Detection Circuit
Watchdog timer
interrupt signal
Voltage monitor 2
interrupt signal
Comparator A2
interrupt signal
Page 41 of 740
Maskable
interrupt signal
Non-maskable
interrupt signal