R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 57

• 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 6.7
Voltage Monitor 1 Circuit Control Register
b7 b6 b5 b4
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9. When the VW1C6 bit is set to 1 (voltage monitor 1 reset mode), set the VW1C7 bit to 1 (w hen VCC reaches Vdet1 or
Set the PRC3 bit in the PRCR register to 1 (rew rite enable) before w riting to the VW1C register.
To use the voltage monitor 1 interrupt to exit stop mode and to return again, w rite 0 to the VW1C1 bit before w riting
1.
Bits VW1C2 and VW1C3 are enabled w hen the VCA26 bit in the VCA2 register is set to 1 (voltage detection 1 circuit
enabled).
Set this bit to 0 by a program. When 0 is w ritten by a program, it is set to 0 (and remains unchanged even if 1 is
w ritten to it).
The VW1C6 bit is enabled w hen the VW1C0 bit is set to 1 (voltage monitor 1 interrupt/enabled reset).
The VW1C0 bit is enabled w hen the VCA26 bit in the VCA2 register is set to 1 (voltage detection 1 circuit enabled).
Set the VW1C0 bit to 0 (disable) w hen the VCA26 bit is set to 0 (voltage detection 1 circuit disabled).
The VW1C7 bit is enabled w hen the VW1C1 bit is set to 1 (digital filter disabled mode).
Bits VW1C2 and VW1C3 remain unchanged after a softw are reset, w atchdog timer reset, voltage monitor 1 reset,
or voltage monitor 2 reset.
below ). (Do not set to 0.)
Feb 29, 2008
b3
b2
VW1C Register
b1 b0
Bit Symbol
VW1C0
VW1C2
VW1C3
VW1C6
VW1C7
VW1C1
VW1F0
VW1F1
Symbol
VW1C
Page 38 of 485
Voltage monitor 1 interrupt/reset
enable bit
Voltage monitor 1 digital filter
disable mode select bit
Voltage change detection
flag
Voltage detection 1 signal monitor
flag
Sampling clock select bits
Voltage monitor 1 circuit mode
select bit
Voltage monitor 1 interrupt/reset
generation condition select bit
(3, 4, 8)
(3, 8)
(5)
(6)
(1)
Address
Bit Name
0036h
(2)
(7, 9)
b5 b4
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
0 : Disable
1 : Enable
0 : Digital filter enabled mode
1 : Digital filter disabled mode
0 : Not detected
1 : Vdet1 crossing detected
0 : VCC < Vdet1
1 : VCC ≥ Vdet1 or voltage detection 1
0 : Voltage monitor 1 interrupt mode
1 : Voltage monitor 1 reset mode
0 : When VCC reaches Vdet1 or above
1 : When VCC reaches Vdet1 or below
(digital filter circuit enabled)
(digital filter circuit disabled)
circuit disabled
After Reset
00001000b
Function
6. Voltage Detection Circuit
(8)
RW
RW
RW
RW
RW
RW
RW
RW
RO