R5F21258SNFP#U0 Renesas Electronics America, R5F21258SNFP#U0 Datasheet - Page 61
![IC R8C/25 MCU FLASH 52LQFP](/photos/12/18/121856/r5f21258snfp_u0_sml.jpg)
R5F21258SNFP#U0
Manufacturer Part Number
R5F21258SNFP#U0
Description
IC R8C/25 MCU FLASH 52LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/25r
Specifications of R5F21258SNFP#U0
Core Size
16/32-Bit
Program Memory Size
64KB (64K x 8)
Core Processor
R8C
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
POR, Voltage Detect, WDT
Number Of I /o
41
Program Memory Type
FLASH
Ram Size
3K 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
No. Of I/o's
41
Ram Memory Size
3KB
Cpu Speed
20MHz
No. Of Timers
4
Digital Ic Case Style
LQFP
Supply Voltage Range
2.2V To 5.5V
Embedded Interface Type
I2C, UART
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
YMCRPR8C25 - REF PLATFORM MOTOR CTRL R8C/25R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
Eeprom Size
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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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
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