R5F21256SNFP#U0 Renesas Electronics America, R5F21256SNFP#U0 Datasheet - Page 276

• Manufacturer Part Number: R5F21256SNFP#U0
• Description: IC R8C MCU FLASH 32K 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21256SNFP#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: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K 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: -

Rev.2.00 Oct 17, 2005
REJ09B0001-0200
5.5 Interrupt Priority
Chapter 5
Figure 5.5.1 Interrupt Priority Levels of Hardware Interrupts
If two or more interrupt requests occur while a single instruction is being executed, the interrupt request that
has higher priority is acknowledged.
The priority level of maskable interrupts (peripheral functions) can be selected arbitrarily by setting bits
ILVL2 to ILVL0. If multiple maskable interrupts are assigned the same priority level, the priority that is set in
hardware determines which is acknowledged.
Special interrupts such as the watchdog timer interrupt have their priority levels set in hardware. Figure
5.5.1 lists the interrupt priority levels of hardware interrupts.
Software interrupts are not affected by interrupt priority. They always cause control to branch to an interrupt
routine when the relevant instruction is executed.
Interrupts
page 256 of 263
Oscillation stop detection
Peripheral function
Watchdog timer
Address match
Single-step
Reset
High
Low
5.5 Interrupt Priority