r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 93

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
7.2.6
Notes:
After Reset
1. The VW1C0 bit is enabled when the VCA26 bit in the VCA2 register is 1 (voltage detection 1 circuit enabled).
2. When the digital filter is used (the VW1C1 bit is 0), set the CM14 bit in the CM1 register to 0 (low-speed on-chip
3. When the VW1C0 bit is 1 (enabled), do not set bits VW1C1 and VW1F0 to VW1F1 at the same time (with one
4. Bits VW1C2 and VW1C3 are enabled when the VC26 bit is 1 (voltage detection 1 circuit enabled).
5. Set to 0 by a program. This bit is set to 0 by writing 0 by a program, but writing 1 has no effect.
6. The VW1C7 bit is enabled when the VCAC1 bit in the VCAC register is 0 (one edge). Set the VCAC1 bit to 0
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 00039h
When the VCA26 bit is 0 (voltage detection 1 circuit disabled), set the VW1C0 bit to 0 (disabled). To set the
VW1C0 bit to 1 (enabled), refer to Table 7.3 Procedure for Setting Bits Associated with Voltage Monitor 1
Interrupt .
oscillator on).
When the voltage monitor 1 interrupt is used to exit stop mode, set the VW1C1 bit in the VW1C register to 1
(digital filter disabled mode).
instruction).
before setting the VW1C7 bit.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW1C register. Rewriting the
VW1C register may set the VW1C2 bit to 1. Rewrite this register before setting the VW1C2 bit to 0.
Symbol VW1C7
Symbol
VW1C0 Voltage monitor 1 interrupt enable bit
VW1C1 Voltage monitor 1 digital filter mode
VW1C2 Voltage change detection flag
VW1C3 Voltage detection 1 signal monitor flag
VW1F0 Sampling clock select bits
VW1F1
VW1C7 Voltage monitor 1 interrupt generation
Bit
Voltage Monitor 1 Circuit Control Register (VW1C)
—
Preliminary document
Specifications in this document are tentative and subject to change.
b7
1
select bit
(4)
Reserved
condition select bit
b6
—
(2, 4)
0
Bit Name
VW1F1
(6)
b5
0
(3)
VW1F0
(4, 5)
b4
0
(1)
VW1C3
b3
1
0: Disabled
1: Enabled
0: Digital filter enabled mode
1: Digital filter disabled mode
0: Not detected
1: Detected by passing through Vdet1
0: VCC  Vdet1
1: VCC  Vdet1 or voltage detection 1 circuit
Set to 0.
0: VCC reaches Vdet1 or above
1: VCC reaches Vdet1 or below
b5 b4
0 0: fLOCO divided by 1
0 1: fLOCO divided by 2
1 0: fLOCO divided by 4
1 1: fLOCO divided by 8
(digital filter circuit enabled)
(digital filter circuit disabled)
disabled
VW1C2
b2
0
VW1C1
Function
b1
1
7. Voltage Detection Circuit
VW1C0
b0
0
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R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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