R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 77

• Manufacturer Part Number: R5F21334CNFP#U0
• Description: MCU 1KB FLASH 16K ROM 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/33Cr

Specifications of R5F21334CNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 27
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/33C Group
REJ09B0570-0100 Rev.1.00 Dec. 14, 2009
Page 47 of 589
6.2.8
Notes:
After Reset
1. The VW2C0 is enabled when the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled).
2. When using the digital filter (while the VW2C1 bit is 0), set the CM14 bit in the CM1 register to 0 (low-speed on-
3. The VW2C2 bit is enabled when the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit
4. Set this bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged even if
5. The VW2C7 bit is enabled when the VCAC2 bit in the VCAC register is set to 0 (one edge). After setting the
6. When the VW2C0 bit is set to 1 (enabled), do not set the VW2C1 bit and bits VW2F1 and VW2F0 simultaneously
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 003Ah
Symbol VW2C7
Set the VW2C0 bit to 0 (disabled) when the VCA27 bit is set to 0 (voltage detection 2 circuit disabled).
To set the VW2C0 bit to 1 (enabled), follow the procedure shown in Table 6.3 Procedure for Setting Bits
Associated with Voltage Monitor 2 Interrupt.
chip oscillator on).
To use the voltage monitor 2 interrupt to exit stop mode, set the VW2C1 bit in the VW2C register to 1 (digital filter
disabled).
enabled).
1 is written to it).
VCAC2 bit to 0, set the VW2C7 bit.
(with one instruction).
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW2C register.
Rewriting the VW2C register may set the VW2C2 bit to 1. After rewriting this register, set the VW2C2 bit to 0.
Bit
VW2C0 Voltage monitor 2 interrupt enable bit
VW2C1 Voltage monitor 2 digital filter
VW2C2 Voltage change detection flag
VW2C3 WDT detection monitor flag
VW2C7 Voltage monitor 2 interrupt
Symbol
VW2F0 Sampling clock select bit
VW2F1
Voltage Monitor 2 Circuit Control Register (VW2C)
—
b7
1
disable mode select bit
Reserved bit
generation condition select bit
b6
—
0
VW2F1
Bit Name
b5
0
(2, 6)
(6)
VW2F0
(4)
b4
0
(3, 4)
(5)
VW2C3
(1)
b3
0
0: Disabled
1: Enabled
0: Digital filter enable mode
1: Digital filter disable mode
0: Not detected
1: Vdet2 passing detected
0: Not detected
1: Detected
b5 b4
Set to 0.
0: When VCC reaches Vdet2 or above.
1: When VCC reaches Vdet2 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)
VW2C2
b2
0
VW2C1
b1
1
Function
VW2C0
6. Voltage Detection Circuit
b0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W