R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 170

• 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 140 of 589
Table 11.3
11.3
Bits ILVL2 to ILVL0
000b
001b
010b
011b
100b
101b
110b
111b
11.3.1
11.3.2
11.3.3
The following describes enabling and disabling maskable interrupts and setting the acknowledgement priority.
This description does not apply to non-maskable interrupts.
Use the I flag in the FLG register, IPL, and bits ILVL2 to ILVL0 in the corresponding interrupt control register
to enable or disable a maskable interrupt. Whether an interrupt is requested or not is indicated by the IR bit in
the corresponding interrupt control register.
The I flag enables or disables maskable interrupts. Setting the I flag to 1 (enabled) enables maskable interrupts.
Setting the I flag to 0 (disabled) disables all maskable interrupts.
The IR bit is set to 1 (interrupt requested) when an interrupt request is generated. After the interrupt request is
acknowledged and the CPU branches to the corresponding interrupt vector, the IR bit is set to 0 (no interrupt
requested).
The IR bit can be set to 0 by a program. Do not write 1 to this bit.
However, the IR bit operations of the timer RC interrupt, the synchronous serial communication unit interrupt,
the I
Synchronous Serial Communication Unit Interrupt, I
Interrupt (Interrupts with Multiple Interrupt Request Sources).
Interrupt priority levels can be set using bits ILVL2 to ILVL0.
Table 11.3 lists the Settings of Interrupt Priority Levels and Table 11.4 lists the Interrupt Priority Levels
Enabled by IPL.
The following are the conditions when an interrupt is acknowledged:
•
•
•
The I flag, IR bit, bits ILVL2 to ILVL0, and IPL are independent of each other. They do not affect one another.
I flag = 1
IR bit = 1
Interrupt priority level > IPL
Interrupt Control
2
C bus interface interrupt, and the flash memory interrupt are different. Refer to 11.7 Timer RC Interrupt,
I Flag
IR Bit
Bits ILVL2 to ILVL0, IPL
Settings of Interrupt Priority
Levels
Level 0 (interrupt disabled)
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Interrupt Priority Level
Priority
High
Low
−
Table 11.4
000b
001b
010b
011b
100b
101b
110b
111b
2
IPL
C bus Interface Interrupt, and Flash Memory
IPL
Interrupt Priority Levels Enabled by
Interrupt level 1 and above
Interrupt level 2 and above
Interrupt level 3 and above
Interrupt level 4 and above
Interrupt level 5 and above
Interrupt level 6 and above
Interrupt level 7 and above
All maskable interrupts are disabled
Enabled Interrupt Priority Level
11. Interrupts