R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 187

• Manufacturer Part Number: R5F21334CNFP#U0
• Description: MCU 1KB FLASH 16K ROM 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/33Cr

Specifications of R5F21334CNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 27
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/33C Group
REJ09B0570-0100 Rev.1.00 Dec. 14, 2009
Page 157 of 589
Figure 11.12
11.8.4
The IR bit in the interrupt control register may be set to 1 (interrupt requested) when the interrupt source
changes. To use an interrupt, set the IR bit to 0 (no interrupt requested) after changing interrupt sources.
Changing interrupt sources as referred to here includes all factors that change the source, polarity, or timing of
the interrupt assigned to a software interrupt number. Therefore, if a mode change of a peripheral function
involves the source, polarity, or timing of an interrupt, set the IR bit to 0 (no interrupt requested) after making
these changes. Refer to the descriptions of the individual peripheral functions for related interrupts.
Figure 11.12 shows a Procedure Example for Changing Interrupt Sources.
IR bit: The interrupt control register bit for the interrupt whose source is to be changed
Notes:
Changing Interrupt Sources
1. The above settings must be executed individually. Do not execute two or more settings
2. To prevent interrupt requests from being generated disable the peripheral function
3. To change the interrupt source to the input with the digital filter used, wait for three or
simultaneously (using one instruction).
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 for the interrupt
whose source is to be changed.
more cycles of the sampling clock of the digital filter before setting the IR bit to 0 (no
interrupt request). Refer to 11.8.5 Rewriting Interrupt Control Register for the
instructions to use and related notes.
Procedure Example for Changing Interrupt Sources
Set the IR bit to 0 (no interrupt request)
(including mode of peripheral function)
using the MOV instruction
Change interrupt sources
Interrupt source change
Disable interrupts
Enable interrupts
Change completed
(2, 3)
(2, 3)
(3)
11. Interrupts