r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 79

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r5f21346mnfp

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

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r5f21346mnfp#V0
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R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
6.2.7
Notes:
After Reset
1. The VW1C0 is enabled when the VCA26 bit in the VCA2 register is set to 1 (voltage detection 1 circuit enabled).
2. When using the digital filter (while the VW1C1 bit is 0), set the CM14 bit in the CM1 register to 0 (low-speed on-
3. Bits VW1C2 and VW1C3 are enabled when the VCA26 bit in the VCA2 register is set to 1 (voltage detection 1
4. Set the VW1C2 bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged
5. The VW1C7 bit is enabled when the VCAC1 bit in the VCAC register is set to 0 (one edge). After setting the
6. When the VW1C0 bit is set to 1 (enabled), do not set the VW1C1 bit and bits VW1F1 and VW1F0 simultaneously
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 0039h
Symbol VW1C7
Set the VW1C0 bit to 0 (disabled) when the VCA26 bit is set to 0 (voltage detection 1 circuit disabled).
To set the VW0C0 bit to 1 (enabled), follow the procedure shown in Table 6.3 Procedure for Setting Bits
Associated with Voltage Monitor 1 Interrupt.
chip oscillator on).
To use the voltage monitor 1 interrupt to exit stop mode, set the VW1C1 bit in the VW1C register to 1 (digital filter
disabled).
circuit enabled).
even if 1 is written to it).
VCAC1 bit to 0, set the VW1C7 bit.
(with one instruction).
Set the PRC3 bit in the PRCR register to 1 (write enabled) before writing the VW1C register.
Rewriting the VW1C register may set the VW1C2 bit to 1. Set the VW1C2 bit to 0 after rewriting the VW1C
register.
Bit
VW1C0 Voltage monitor 1 interrupt enable bit
VW1C1 Voltage monitor 1 digital filter
VW1C2 Voltage change detection flag
VW1C3 Voltage detection 1 signal monitor flag
VW1C7 Voltage monitor 1 interrupt
Symbol
VW1F0 Sampling clock select bit
VW1F1
Voltage Monitor 1 Circuit Control Register (VW1C)
b7
1
disable mode select bit
Reserved bit
generation condition select bit
b6
0
VW1F1
Bit Name
b5
0
(2, 6)
(6)
VW1F0
b4
0
(3, 4)
(5)
VW1C3
(1)
(3)
b3
1
0: Disabled
1: Enabled
0: Digital filter enabled mode
1: Digital filter disable mode
0: Not detected
1: Vdet1 passing detected
0: VCC
1: VCC
b5 b4
Set to 0.
0: When VCC reaches Vdet1 or above.
1: When VCC reaches Vdet1 or below.
0 0: fOCO-S divided by 1
0 1: fOCO-S divided by 2
1 0: fOCO-S divided by 4
1 1: fOCO-S divided by 8
(digital filter circuit enabled)
(digital filter circuit disabled)
or voltage detection 1 circuit disabled
VW1C2
b2
<
0
Vdet1
Vdet1
VW1C1
b1
1
Function
VW1C0
6. Voltage Detection Circuit
b0
0
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