R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 55

• 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 6.5
Voltage Detection Register 1
Voltage Detection Register 2
b7 b6 b5 b4 b3 b2 b1 b0
NOTES:
b7 b6 b5 b4
NOTES:
0 0 0 0
1.
2.
1.
2.
3.
4.
5.
6. Use the VCA20 bit only w hen entering to w ait mode. To set the VCA20 bit, follow the procedure show n in Figure
The VCA13 bit is enabled w hen the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled).
The VCA13 bit is set to 1 (VCC ≥ Vdet 2) w hen the VCA27 bit in the VCA2 register is set to 0 (voltage detection 2
circuit disabled).
The softw are reset, w atchdog timer reset, voltage monitor 1 reset, and voltage monitor 2 reset do not affect this
register.
Set the PRC3 bit in the PRCR register to 1 (w rite enable) before w riting to the VCA2 register.
To use the voltage monitor 0 reset, set the VCA25 bit to 1.
After the VCA25 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting
operation.
To use the voltage monitor 1 interrupt/reset or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1.
After the VCA26 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting
operation.
To use the voltage monitor 2 interrupt/reset or the VCA13 bit in the VCA1 register, set the VCA27 bit to 1.
After the VCA27 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting
operation.
Softw are reset, w atchdog timer reset, voltage monitor 1 reset, and voltage monitor 2 reset do not affect this
register.
10.9 Procedure for Enabling Reduced Internal Pow er Consum ption Using VCA20 bit.
Feb 29, 2008
0
b3 b2 b1 b0
0 0 0
0
Registers VCA1 and VCA2
0 0
Bit Symbol
Bit Symbol
(b2-b0)
(b7-b4)
Symbol
VCA13
VCA20
(b4-b1)
VCA25
VCA26
VCA27
Symbol
VCA1
VCA2
Page 36 of 485
—
—
—
(1)
Reserved bits
Voltage detection 2 signal monitor
flag
Reserved bits
Internal pow er low
consumption enable bit
Reserved bits
Voltage detection 0 enable
bit
Voltage detection 1 enable
bit
Voltage detection 2 enable
bit
(2)
(3)
(4)
(1)
Address
Bit Name
0032h
Address
Bit Name
0031h
(6)
The LVD0ON bit in the OFS register is
set to 1 and hardw are reset
Pow er-on reset, voltage monitor 0 reset
or LVD0ON bit in the OFS register is
set to 0, and hardw are reset
0 : Disables low consumption
1 : Enables low consumption
Set to 0.
0 : Voltage detection 0 circuit disabled
1 : Voltage detection 0 circuit enabled
0 : Voltage detection 1 circuit disabled
1 : Voltage detection 1 circuit enabled
0 : Voltage detection 2 circuit disabled
1 : Voltage detection 2 circuit enabled
Set to 0.
0 : VCC < Vdet2
1 : VCC ≥ Vdet2 or voltage detection 2
Set to 0.
circuit disabled
After Reset
Function
After Reset
00001000b
Function
(5)
6. Voltage Detection Circuit
(2)
: 00h
: 00100000b
RW
RW
RW
RW
RW
RW
RW
RW
RW
RO