R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 62

• 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
Figure 6.10
When the VW1C1 bit is set
to 0 (digital filter enabled)
When the VW1C1 bit is
set to 1 (digital filter
disabled) and the
VW1C7 bit is set to 0
(Vdet1 or above)
When the VW1C1 bit is
set to 1 (digital filter
disabled) and the
VW1C7 bit is set to 1
(Vdet1 or below)
VW1C1, VW1C2, VW1C3, VW1C6, VW1C7: Bit in VW1C Register
Feb 29, 2008
Example of Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset Operation
VW1C3 bit
VW1C2 bit
Voltage monitor 1
interrupt request
(VW1C6 = 0)
Internal reset signal
(VW1C6 = 1)
VW1C2 bit
Voltage monitor 1
interrupt request
(VW1C6 = 0)
VW1C2 bit
Voltage monitor 1
interrupt request
(VW1C6 = 0)
Internal reset signal
(VW1C6 = 1)
The above applies under the following conditions.
NOTE:
• VCA26 bit in VCA2 register = 1 (voltage detection 1 circuit enabled)
• VW1C0 bit in VW1C register = 1 (voltage monitor 1 interrupt and voltage monitor 1 reset enabled)
1. If voltage monitor 0 reset is not used, set the power supply to VCC ≥ 2.2.
Page 43 of 485
2.2 V
Vdet1
(1)
VCC
1
0
1
0
1
0
1
0
4 cycles of sampling clock of digital filter
Set to 0 by interrupt
request acknowledgement
Set to 0 by a program
Set to 0 by interrupt request
acknowledgement
Set to 0 by a program
4 cycles of sampling clock of digital filter
6. Voltage Detection Circuit
Set to 0 by a program
Set to 0 by interrupt
request
acknowledgement