R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 54

• 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 6.3
Figure 6.4
Internal
reference
voltage
Internal
reference
voltage
Voltage detection 2 circuit
Watchdog timer block
Voltage detection 1 circuit
VCC
VCC
VW1C0 to VW1C3, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register
VCA26: Bit in VCA2 register
VW2C0 to VW2C3, VW2F0, VW2F1, VW2C6, VW2C7: Bits in VW2C register
VCA13: Bit in VCA1 register
VCA27: Bit in VCA2 register
VCA27
+
VCA26
+
-
-
(Filter width: 200 ns)
Feb 29, 2008
(Filter width: 200 ns)
Noise filter
Noise filter
Block Diagram of Voltage Monitor 1 Interrupt/Reset Generation Circuit
Block Diagram of Voltage Monitor 2 Interrupt/Reset Generation Circuit
Watchdog timer
underflow signal
Voltage detection 2 signal
is held “H” when VCA27 bit
is set to 0 (disabled)
Voltage detection 1 signal
is held “H” when VCA26 bit
is set to 0 (disabled)
Page 35 of 485
fOCO-S
fOCO-S
Voltage
detection
2 signal
Voltage
detection
1 signal
VCA13
Voltage monitor 1 interrupt/reset generation circuit
Voltage monitor 2 interrupt/reset generation circuit
This bit is set to 0 (not detected) by writing 0
by a program.
VW1C3
VW2C3
1/2
1/2
1/2
1/2
VW2F1 to VW2F0
VW1F1 to VW1F0
1/2
1/2
VW1C7
VW2C7
= 00b
= 01b
= 10b
= 11b
= 00b
= 01b
= 10b
= 11b
VW2C1
VW1C1
Digital
filter
Digital
filter
VW2C2 bit is set to 0 (not detected) by
writing 0 by a program.
When VCA27 bit is set to 0 (voltage
detection 2 circuit disabled), VW2C2
bit is set to 0
VW1C2 bit is set to 0 (not detected) by
writing 0 by a program.
When VCA26 bit is set to 0 (voltage
detection 1 circuit disabled), VW1C2
bit is set to 0
VW1C1
VW2C1
VW2C0
VW1C0
VW1C6
VW2C6
VW1C2
VW2C2
6. Voltage Detection Circuit
Voltage monitor 1
interrupt signal
Oscillation stop
Voltage monitor 2
interrupt signal
Oscillation stop
timer interrupt
interrupt signal
timer interrupt
interrupt signal
Watchdog
Watchdog
detection
detection
signal
signal
Voltage monitor 2
reset signal
Voltage monitor 1
reset signal
Non-maskable
interrupt signal
Non-maskable
interrupt signal