R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 72

• Manufacturer Part Number: R5F21324CNSP#U0
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Cr

Specifications of R5F21324CNSP#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: 15
• 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 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-LSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 43 of 573
6.2.4
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 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1.
5. To use the voltage detection 2 interrupt or the VCA13 bit in the VCA1 register, set the VCA27 bit to 1.
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 0034h
Symbol
Figure 9.3 Procedure for Reducing Internal Power Consumption Using VCA20 bit.
mode).
After the VCA26 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 1 circuit starts
operation.
After the VCA27 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 2 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
VCA25 Voltage detection 0 enable bit
VCA26 Voltage detection 1 enable bit
VCA27 Voltage detection 2 enable bit
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
Reserved bits
VCA26
b6
0
0
(1)
Bit Name
VCA25
b5
0
1
b4
—
0
0
(3)
(4)
(5)
0: Low consumption disabled
1: Low consumption enabled
Set to 0.
0: Voltage detection 0 circuit disabled
1: Voltage detection 0 circuit enabled
0: Voltage detection 1 circuit disabled
1: Voltage detection 1 circuit enabled
0: Voltage detection 2 circuit disabled
1: Voltage detection 2 circuit enabled
b3
—
0
0
b2
—
0
0
Function
b1
—
0
0
(2)
VCA20
6. Voltage Detection Circuit
b0
0
0
R/W
R/W
R/W
R/W
R/W
R/W