R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 491

• 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
Figure 22.1
22.2.4
The IR bit in the interrupt control register may be set to 1 (interrupt requested) when the interrupt source
changes. When using an interrupt, set the IR bit to 0 (no interrupt requested) after changing the interrupt source.
In addition, the changes of interrupt sources include all sources that change the interrupt sources assigned to
individual software interrupt numbers, polarities, and timing. Therefore, when a mode change of the peripheral
functions involves interrupt sources, edge polarities, and timing, Set the IR bit to 0 (no interrupt requested) after
the change. Refer to each peripheral function for the interrupts caused by the peripheral functions.
Figure 22.1 shows an Example of Procedure for Changing Interrupt Sources.
Changing Interrupt Sources
Example of Procedure for Changing Interrupt Sources
NOTES:
IR bit:
1. Execute the above settings individually. Do not execute two
2. To prevent interrupt requests from being generated, disable
3. Refer to 12.6.5 Changing Interrupt Control Register
Page 469 of 501
or more settings at once (by one instruction).
the peripheral function before changing the interrupt
source. In this case, use the I flag if all maskable interrupts
can be disabled. If all maskable interrupts cannot be
disabled, use bits ILVL0 to ILVL2 of the interrupt whose
source is changed.
Contents for the instructions to be used and usage notes.
The interrupt control register bit of an
interrupt whose source is changed.
Set the IR bit to 0 (interrupt not requested)
Change interrupt source (including mode
using the MOV instruction
Interrupt source change
of peripheral function)
Disable interrupts
Enable interrupts
Change completed
(2, 3)
(2, 3)
(3)
22. Usage Notes