R8C35A Datasheet, PDF (71/766 Pages) Renesas Technology Corp – MCU M16C FAMILY / R8C/Tiny SERIES

Under development ^{Preliminary specification}
Specifications in this manual are tentative and subject to change
R8C/35A Group
6. Voltage Detection Circuit
Voltage monitor 0 reset generation circuit
Voltage detection 0 circuit
VCA25
fOCO-S
VCC
VDSEL1
to VDSEL0
Level selection
+
-
Internal reference voltage
Voltage
detection 0
signal
When VCA25 bit is set to 0 (disabled),
voltage detection 0 signal is driven high.
VW0F1 to VW0F0
= 00b
= 01b
= 10b
1/2 1/2 1/2 ^{= 11b}
VW0C1
Digital filter
VW0C1
VW0C0
VW0C0, VW0C1, VW0F0, VW0F1: Bits in VW0C register
VCA25: Bit in VCA2 register
VDSEL0, VDSEL1: Bits in OFS register
Figure 6.2 Block Diagram of Voltage Monitor 0 Reset Generation Circuit
Voltage monitor 0
reset signal
Voltage monitor 1 interrupt generation circuit
Voltage detection 1 circuit
VCA26
fOCO-S
VCC
VD1S3
to VD1S0
Level
VCA22 = 0
selection
+
VCA21 = 0
-
Internal reference voltage
Voltage
detection 1
signal
When VCA26 bit is set to 0 (disabled),
voltage detection 1 signal is driven high.
VW1F1 to VW1F0
= 00b
= 01b
= 10b
1/2 1/2 1/2 ^{= 11b}
VW1C3
VW1C1 = 0
VW1C1 = 1
VW1C2 bit is set to 0 (not detected) by writing 0 by a program.
When VCA26 bit is set to 0 (voltage detection 1 circuit disabled),
VW1C2 bit is set to 0.
Digital filter
Edge
selection
circuit
VW1C2
VCA1C
VW1C7
VW1C0
Watchdog timer
interrupt signal
Voltage monitor 1
interrupt signal
Non-maskable
interrupt signal
Comparator A1
interrupt signal
VW1C0 to VW1C3, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register
VCA21, VCA22, VCA26: Bits in VCA2 register
VD1S0 to VD1S3: Bits in VD1LS register
COMPSEL, IRQ1SEL: Bits in CMPA register
VCA1C: Bit in VCAC register
COMPSEL
IRQ1SEL
Figure 6.3 Block Diagram of Voltage Monitor 1 Interrupt Generation Circuit
Maskable
interrupt signal
REJ09B0407-0010 Rev.0.10 Jan 16, 2008
Page 40 of 728