R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 211

• 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 181 of 589
15.2.8
Note:
After Reset
1.
NMIF Bit (Non-Maskable Interrupt Generation Bit)
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 0080h
This bit is set to 0 when the read result is 1 and 0 is written to the same bit. This bit remains
unchanged even if the read result is 0 and 0 is written to the same bit. This bit remains unchanged if
1 is written to it.
The DTCTL register controls DTC activation when a non-maskable interrupt (an interrupt by the watchdog
timer, oscillation stop detection, voltage monitor 1, or voltage monitor 2) is generated.
The NMIF bit is set to 1 when a watchdog timer interrupt, an oscillation stop detection interrupt, a voltage
monitor 1 interrupt, or a voltage monitor 2 interrupt is generated.
When the NMIF bit is 1, the DTC is not activated even if the interrupt which enables DTC activation is
generated. If the NMIF bit is changed to 1 during DTC transfer, the transfer is continued until it is completed.
When an interrupt source is the watchdog timer, wait for the following cycles before writing 0 to the NMIF bit:
If the WDTC7 bit in the WDTC register is set to 0 (divide-by-16 using the prescaler), wait for 16 cycles of the
CPU clock after the interrupt source is generated.
If the WDTC7 bit is set to 1 (divide-by-128 using the prescaler), wait for 128 cycles of the CPU clock after the
interrupt source is generated.
When an interrupt source is oscillation stop detection, set to the OCD1 bit in the OCD register to 0 (oscillation
stop detection interrupt disabled) before writing 0 to the NMIF bit.
Symbol
Symbol
Bit
NMIF
DTC Activation Control Register (DTCTL)
—
—
—
—
—
—
—
b7
—
0
Reserved bit
Non-maskable interrupt generation
bit
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
(1)
b6
—
0
Bit Name
b5
—
0
b4
—
0
Set to 0.
0: Non-maskable interrupts not generated
1: Non-maskable interrupts generated
b3
—
0
b2
—
0
Function
NMIF
b1
0
b0
—
0
15. DTC
R/W
R/W
R/W
—