Renesas R8C/18 Series Hardware Manual page 58

R8C/18 Group, R8C/19 Group
Voltage Detection Register 1
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 0
NOTES:
1. The VCA13 bit is enabled w hen the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled).
The VCA13 bit is set to 1 (VCC ≥ Vdet 2) w hen the VCA27 bit in the VCA2 register is set to 0 (voltage detection 2
circuit disabled).
2. The softw are reset, w atchdog timer reset, and voltage monitor 2 reset do not affect this register.
Voltage Detection Register 2
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0
NOTES:
1. Set the PRC3 bit in the PRCR register to 1 (w rite enable) before w riting to this register.
2. To use the voltage monitor 1 reset, set the VCA26 bit to 1.
After the VCA26 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting
operation.
3. To use the voltage monitor 2 interrupt/reset or the VCA13 bit in the VCA1 register, set the VCA27 bit to 1.
After the VCA27 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting
operation.
4. Softw are reset, w atchdog timer reset, and voltage monitor 2 reset do not affect this register.
Figure 7.4 Registers VCA1 and VCA2
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Symbol Address
0031h
VCA1
Bit Symbol Bit Name
— Reserved bits
(b2-b0)
Voltage detection 2 signal monitor
(1)
flag
VCA13
— Reserved bits
(b7-b4)
(1)
Symbol Address
VCA2 0032h
Bit Symbol Bit Name
— Reserved bits
(b5-b0)
Voltage detection 1 enable bit
VCA26
Voltage detection 1 enable bit
VCA27
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After Reset
00001000b
Function
Set to 0.
0 : VCC < Vdet2
1 : VCC ≥ Vdet2 or voltage detection 2
circuit disabled
Set to 0.
After Reset
Hardw are reset : 00h
Pow er-on reset, voltage monitor 1 reset
: 01000000b
Function
Set to 0.
(2)
0 : Voltage detection 1 circuit disabled
1 : Voltage detection 1 circuit enabled
(3)
0 : Voltage detection 2 circuit disabled
1 : Voltage detection 2 circuit enabled
7. Voltage Detection Circuit
(2)
RW
RW
RO
RW
(4)
RW
RW
RW
RW