r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 153

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

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
9.2.14
Notes:
After Reset
After Reset
1. Use the VCA20 bit only when the MCU enters wait mode. To set the VCA20 bit, follow the procedure shown in
2. When the VCA20 bit is set to 1 (low consumption enabled), do not set the CM10 bit in the CM1 register to 1 (stop
3. When writing to the VCA25 bit, set a value after reset.
4. To use the voltage detection 1/comparator A1 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit
5. To use the voltage detection 2/comparator A2 interrupt or the VCA13 bit in the VCA1 register, set the VCA27 bit
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 0034h
Symbol
33.2.9 Reducing Internal Power Consumption Using VCA20 Bit .
mode).
to 1.
After the VCA26 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 1/comparator A1 circuit
starts operation.
to 1.
After the VCA27 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 2/comparator A2 circuit
starts operation.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VCA2 register.
Bit
Symbol
VCA20 Internal power low consumption
VCA21 Comparator A1 reference voltage
VCA22 LVCMP1 comparison voltage
VCA23 Comparator A2 reference voltage
VCA24 LVCMP2 comparison voltage
VCA25 Voltage detection 0 enable bit
VCA26 Voltage detection 1/comparator A1
VCA27 Voltage detection 2/comparator A2
Voltage Detect Register 2 (VCA2)
The above applies when the LVDAS bit in the OFS register is set to 1.
The above applies when the LVDAS bit in the OFS register is set to 0.
VCA27
b7
0
0
enable bit
input select bit
external input select bit
input select bit
external input select bit
enable bit
enable bit
VCA26
b6
0
0
(1)
(4)
(5)
Bit Name
VCA25
b5
0
1
VCA24
b4
0
0
(3)
0: Low consumption disabled
1: Low consumption enabled
0: Internal reference voltage
1: LVREF pin input voltage.
0: Supply voltage (VCC)
1: LVCMP1 pin input voltage
0: Internal reference voltage
1: LVREF pin input voltage
0: Supply voltage (VCC) (Vdet2_0)
1: LVCMP2 pin input voltage (Vdet2_EXT)
0: Voltage detection 0 circuit disabled
1: Voltage detection 0 circuit enabled
0: Voltage detection 1/comparator A1 circuit disabled
1: Voltage detection 1/comparator A1 circuit enabled
0: Voltage detection 2/comparator A2 circuit disabled
1: Voltage detection 2/comparator A2 circuit enabled
VCA23
b3
0
0
VCA22
b2
0
0
VCA21
Function
b1
0
0
(2)
VCA20
9. Clock Generation Circuit
b0
0
0
Page 121 of 740
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W