R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 44

• 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
5.
The following resets are implemented: hardware reset, power-on reset, voltage monitor 0 reset, voltage monitor 1
reset, voltage monitor 2 reset, watchdog timer reset, and software reset.
Table 5.1 lists the Reset Names and Sources.
Figure 5.1
Table 5.1
Hardware reset
Power-on reset
Voltage monitor 0 reset
Voltage monitor 1 reset
Voltage monitor 2 reset
Watchdog timer reset
Software reset
Resets
RESET
VCC
Feb 29, 2008
Reset Name
Reset Names and Sources
Block Diagram of Reset Circuit
Power-on reset
Page 25 of 485
Watchdog
detection
Voltage
circuit
circuit
timer
CPU
Input voltage of RESET pin is held “L”
VCC rises
VCC falls (monitor voltage: Vdet0)
VCC falls (monitor voltage: Vdet1)
VCC falls (monitor voltage: Vdet2)
Underflow of watchdog timer
Write 1 to PM03 bit in PM0 register
Voltage monitor 1 reset
Voltage monitor 2
reset
Voltage monitor 0 reset
Watchdog timer
reset
Software reset
Power-on reset
Hardware reset
VCA13: Bit in VCA1 register
VCA25, VCA26, VCA27: Bits in VCA2 register
VW0C0, VW0C1, VW0C6, VW0F0, VW0F1, VW0C7: Bits in VW0C register
VW1C2, VW1C3: Bits in VW1C register
VW2C2, VW2C3: Bits in VW2C register
Source
SFRs
SFRs
SFRs
Pin, CPU, and
SFR bits other than
those listed above
Bits VCA25,
VW0C0, and
VW0C6
Bits VCA25,
VW0C0, and
VW0C6
Bits VCA13, VCA26, VCA27,
VW1C2, VW1C3,
VW2C2, VW2C3,
VW0C1, VW0F0,
VW0F1, and VW0C7
5. Resets