Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,
R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group
6. Voltage Detection Circuit
6.6
Voltage Monitor 2 Interrupt
To use the voltage monitor 2 interrupt to exit stop mode, set the VW2C1 bit in the VW2C register to 1 (digital filter
disabled).
Table 6.5
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
Procedure for Setting Bits Associated with Voltage Monitor 2 Interrupt
When Using Digital Filter
When Using No Digital Filter
Set the VCA23 bit in the VCA2 register to 0 (internal reference voltage).
Set the VCA24 bit in the VCA2 register to 0 (VCC voltage) or 1 (LCVCMP2 pin input voltage).
Set the VCA27 bit in the VCA2 register to 1 (voltage detection 2 circuit enabled).
Wait for td(E-A).
Set the COMPSEL bit in the CMPA register to 1.
Select the interrupt type by the IRQ2SEL in the CMPA register.
Select the sampling clock of the digital filter by Set the VW2C1 bit in the VW2C register to 1
bits VW2F1 to VW2F0 in the VW2C register.
(digital filter disabled).
Set the VW2C1 bit in the VW2C register to 0
−
(digital filter enabled).
Select the interrupt request timing by the VCAC2 bit in the VCAC register and
the VW2C7 bit in the VW2C register.
Set the VW2C2 bit in the VW2C register to 0.
Set the CM14 bit in the CM1 register to 0
−
(low-speed on-chip oscillator on).
−
(No wait time required)
Wait for 2 cycles of the sampling clock of
the digital filter.
Set the VW2C0 bit in the VW2C register to 1 (voltage monitor 2 interrupt enabled).
Notes:
1. When the VW2C0 bit is set to 0, steps 1, 2, and 3 can be executed simultaneously (with one
instruction).
2. When the VW2C0 bit is set to 0, steps 5 and 6 can be executed simultaneously (with one instruction).
3. When the VW2C0 bit is set to 0, steps 7 and 8 can be executed simultaneously (with one instruction).
REJ09B0441-0010 Rev.0.10
Page 76 of 809
Jul 30, 2008
RENESAS [ RENESAS TECHNOLOGY CORP ]
