R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 53

• Manufacturer Part Number: R5F21238DFP#U0
• Description: IC R8C/23 MCU FLASH 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21238DFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Peripherals: POR, Voltage Detect, WDT
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: CAN, I²C, LIN, SIO, SSU, UART/USART
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Embedded Interface Type: CAN, I2C, UART
• Rohs Compliant: Yes
• Cpu Family: R8C
• Device Core Size: 16b
• Frequency (max): 20MHz
• Interface Type: I2C/UART
• Total Internal Ram Size: 3KB
• # I/os (max): 41
• Number Of Timers - General Purpose: 5
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 12-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
5.1
5.1.1
5.1.2
A reset is applied using the RESET pin. When an “L” signal is applied to the RESET pin while the power supply
voltage meets the recommended performance condition, the pins, CPU, and SFR are reset (refer to Table 5.2 Pin
Functions after Reset). When the input level applied to the RESET pin changes “L” to “H”, the program is
executed beginning with the address indicated by the reset vector. After reset, the low-speed on-chip oscillator
clock divided-by-8 is automatically selected for the CPU clock.
Refer to 4. Special Function Registers (SFRs) for the status of the SFR after reset.
The internal RAM is not reset. If the RESET pin is pulled “L” during writing to the internal RAM, the internal
RAM will be in indeterminate state.
Figure 5.5 shows the Example of Hardware Reset Circuit and Operation and Figure 5.6 shows the Example of
Hardware Reset Circuit (Usage Example of External Supply Voltage Detection Circuit) and Operation.
Hardware Reset
(1) Apply “L” to the RESET pin.
(2) Wait for 10µs or more.
(3) Apply “H” to the RESET pin.
(1) Apply “L” to the RESET pin.
(2) Let the power supply voltage increase until it meets the recommended performance condition.
(3) Wait for td(P-R) or more to allow the internal power supply to stabilize (refer to 21. Electrical
(4) Wait for 10µs or more.
(5) Apply “H” to the RESET pin.
When Power Supply is Stable
Power On
Characteristics).
Page 31 of 501
5. Resets