R8C2H Datasheet, PDF (72/367 Pages) Renesas Technology Corp – MCU

R8C/2H Group, R8C/2J Group
6. Voltage Detection Circuit
Vdet2
VCC
2.2 V⁽¹⁾
1
VCA13 bit
0
When the VW2C1 bit is set to 0
(digital filter enabled) and the
VCAC2 bit is set to 1 (both edges)
1
VW2C2 bit
0
Voltage monitor 2
interrupt request
(VW2C6 = 0)
Internal reset signal
(VW2C6 = 1)
2 cycles of sampling clock of
digital filter
2 cycles of sampling clock of
digital filter
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
When the VW2C1 bit is set to 0
1
(digital filter enabled), and the
VW2C2 bit
VCAC2 bit is set to 0 (one edge),
0
and the VW2C7 bit is set to 0 (when
VCC reaches Vdet2 or above)
Voltage monitor 2
interrupt request
(VW2C6 = 0)
When the VW2C1 bit is set to 0
(digital filter enabled), and the
VCAC2 bit is set to 0 (one edge),
and the VW2C7 bit is set to 1
(when VCC reaches Vdet2 or
below)
1
VW2C2 bit
0
Voltage monitor 2
interrupt request
(VW2C6 = 0)
Internal reset signal
(VW2C6 = 1)
When the VW2C1 bit is set to 1
(digital filter disabled) and the
VCAC2 bit is set to 1 (both edges)
1
VW2C2 bit
0
Voltage monitor 2
interrupt request
(VW2C6 = 0)
Internal reset signal
(VW2C6 = 1)
When the VW2C1 bit is set to 1
(digital filter disabled), and the
VCAC2 bit is set to 0 (one edge),
and the VW2C7 bit is set to 0
(when VCC reaches Vdet2 or
above)
When the VW2C1 bit is set to 1
(digital filter disabled), and the
VCAC2 bit is set to 0 (one edge),
and the VW2C7 bit is set to 1
(when VCC reaches Vdet2 or
below)
1
VW2C2 bit
0
Voltage monitor 2
interrupt request
(VW2C6 = 0)
1
VW2C2 bit
0
Voltage monitor 2
interrupt request
(VW2C6 = 0)
Internal reset signal
(VW2C6 = 1)
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
VCA13: Bit in VCA1 register
VW2C1, VW2C2, VW2C6, VW2C7: Bits in VW2C register
VCAC2: Bit in VCAC register
The above applies under the following conditions.
• VCA27 bit in VCA2 register = 1 (voltage detection 2 circuit enabled)
• VW2C0 bit in VW2C register = 1 (voltage monitor 2 interrupt and voltage monitor 2 reset enabled)
NOTE:
1. When voltage monitor 0 reset is not used, set the power supply to VCC ≥ 2.2.
Figure 6.13 Example of Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset Operation
Rev.1.00 Mar 28, 2008 Page 52 of 341
REJ09B0388-0100