R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 46

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
6.
The voltage detection circuit is a circuit to monitor the input voltage to the VCC pin. This circuit monitors the VCC
input voltage by the program. And the voltage monitor 1 reset, voltage monitor 2 interrupt and voltage monitor 2 reset
can be used.
Table 6.1 lists the Specifications of Voltage Detection Circuit and Figures 6.1 to 6.3 show the Block Diagrams.
Figures 6.4 to 6.6 show the Associated Registers.
Table 6.1
VCC Monitor
Process When Voltage Is
Detected
Digital Filter
Voltage Detection Circuit
Specifications of Voltage Detection Circuit
Page 28 of 458
Item
Voltage to monitor
Detection target
Monitor
Reset
Interrupt
Switch
enabled/disabled
Sampling time
Vdet1
Whether passing
through Vdet1 by rising
or falling
None
Voltage monitor 1 reset
Reset at Vdet1 > VCC;
Restart CPU operation at
VCC > Vdet1
None
Available
(Divide-by-n of fOCO-S)
x 4
n: 1, 2, 4 and 8
Voltage Detection 1
Vdet2
Whether passing
through Vdet2 by rising
or falling
VCA13 bit in VCA1
register
Whether VCC is higher
or lower than Vdet2
Voltage monitor 2 reset
Reset at Vdet2 > VCC
Restart CPU operation
after a specified time
Voltage monitor 2
interrupt
Interrupt request at
Vdet2 > VCC and VCC >
Vdet2 when digital filter
is enabled;
Interrupt request at
Vdet2 > VCC or VCC >
Vdet2 when digital filter
is disabled
Available
(Divide-by-n of fOCO-S)
x 4
n: 1, 2, 4 and 8
6. Voltage Detection Circuit
Voltage Detection 2