R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 53

• 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 6.1
Figure 6.2
Internal
reference
voltage
VCC
Voltage detection 0 circuit
VCC
VW0C0 to VW0C1, VW0F0 to VW0F1, VW0C6, VW0C7: Bits in VW0C register
VCA25: Bit in VCA2 register
VCA25
+
-
Feb 29, 2008
Block Diagram of Voltage Monitor 0 Reset Generation Circuit
Block Diagram of Voltage Detection Circuit
Voltage detection 0
signal is held “H” when
VCA25 bit is set to 0
(disabled)
Internal
reference
voltage
Page 34 of 485
fOCO-S
Voltage
detection 0
signal
VCA27
VCA26
VCA25
+
+
+
-
-
-
Voltage monitor 0 reset generation circuit
≥ Vdet2
≥ Vdet1
≥ Vdet0
1/2
1/2
VW0F1 to VW0F0
1/2
= 00b
= 01b
= 10b
= 11b
VW0C7
Noise
Noise
filter
filter
Digital
filter
VW0C1
VW0C1
6. Voltage Detection Circuit
VW0C0
VW0C6
VW1C register
VCA1 register
Voltage detection 2
signal
Voltage detection 1
signal
Voltage detection 0
signal
VW1C3 bit
VCA13 bit
b3
b3
Voltage monitor 0
reset signal