R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 61

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#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: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
6.3
Table 6.3
NOTES:
Table 6.3 lists the Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt and Reset. Figure 6.10
shows an Example of Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset Operation. To use the voltage
monitor 1 interrupt or voltage monitor 1 reset to exit stop mode, set the VW1C1 bit in the VW1C register to 1
(digital filter disabled).
1. Set the VW1C7 bit to 1 (when VCC reaches Vdet1 or below) for the voltage monitor 1 reset.
2. When the VW1C0 bit is set to 0, steps 3, 4, and 5 can be executed simultaneously (with 1
Step
4
5
1
2
3
6
7
8
9
(2)
(2)
instruction).
Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset
Feb 29, 2008
Set the VCA26 bit in the VCA2 register to 1 (voltage detection 1 circuit enabled)
Wait for td(E-A)
Select the sampling clock of the digital filter
by the VW1F0 to VW1F1 bits in the VW1C
register
Set the VW1C1 bit in the VW1C register to 0
(digital filter enabled)
Set the VW1C6 bit in
the VW1C register to
0 (voltage monitor 1
interrupt mode)
Set the VW1C2 bit in the VW1C register to 0 (passing of Vdet1 is not detected)
Set the CM14 bit in the CM1 register to 0
(low-speed on-chip oscillator on)
Wait for 4 cycles of the sampling clock of the
digital filter
Set the VW1C0 bit in the VW1C register to 1 (voltage monitor 1 interrupt/reset enabled)
Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt and Reset
Voltage Monitor 1
Interrupt
Page 42 of 485
When Using Digital Filter
Set the VW1C6 bit in
the VW1C register to
1 (voltage monitor 1
reset mode)
Voltage Monitor 1
Reset
Select the timing of the interrupt and reset
request by the VW1C7 bit in the VW1C
register
Set the VW1C1 bit in the VW1C register to 1
(digital filter disabled)
Set the VW1C6 bit in
the VW1C register to
0 (voltage monitor 1
interrupt mode)
−
− (No wait time required)
Voltage Monitor 1
Interrupt
(1)
When Not Using Digital Filter
6. Voltage Detection Circuit
Set the VW1C6 bit in
the VW1C register to
1 (voltage monitor 1
reset mode)
Voltage Monitor 1
Reset