R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 690

• Manufacturer Part Number: R5F21346CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/34Cr

Specifications of R5F21346CNFP#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: 43
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K 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: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/34C Group
REJ09B0586-0100 Rev.1.00 Jan 13, 2010
Page 657 of 723
Figure 32.1
32.2.9
Step (1)
Step (2)
Step (3)
Step (4)
Step (5)
Step (6)
Step (7)
Step (8)
Notes:
VCA20: Bit in VCA2 register
1. Execute this routine to handle all interrupts generated in wait mode.
2. Do not set the VCA20 bit to 0 with the instruction immediately after setting the VCA20 bit to 1. Also, do not do the opposite.
3. When the VCA20 bit is set to 1, do not set the CM10 bit to 1 (stop mode).
4. When the MCU enters wait mode, follow 9.7.2 Wait Mode.
However, this does not apply if it is not necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine.
When the MCU enters wait mode using low-speed clock mode or low-speed on-chip oscillator mode, internal
power consumption can be reduced by using the VCA20 bit in the VCA2 register. Figure 32.1 shows the
Handling Procedure for Reducing Internal Power Consumption Using VCA20 Bit. To enable reduced internal
power consumption by the VCA20 bit, follow Figure 32.1 Handling Procedure for Reducing Internal
Power Consumption Using VCA20 Bit.
(internal power low consumption enabled)
(internal power low consumption disabled)
(Wait until XIN clock or high-speed on-chip
Procedure for enabling reduced internal
power consumption using VCA20 bit
oscillator clock oscillation stabilizes)
high-speed on-chip oscillator mode
high-speed on-chip oscillator clock
high-speed on-chip oscillator clock
low-speed on-chip oscillator mode
Reducing Internal Power Consumption
Enter high-speed clock mode or
Enter low-speed clock mode or
Handling Procedure for Reducing Internal Power Consumption Using VCA20 Bit
Stop XIN clock and
Enter wait mode
Start XIN clock or
VCA20 ← 1
VCA20 ← 0
(4)
(2, 3)
(2)
Exit wait mode by interrupt
Step (5)
Step (6)
Step (7)
Step (8)
Step (1)
Step (2)
Step (3)
(internal power low consumption enabled)
(This is automatically set when exiting wait mode)
(Wait until XIN clock or high-speed on-chip
(internal power low consumption disabled)
or high-speed on-chip oscillator clock
oscillator clock oscillation stabilizes)
high-speed on-chip oscillator mode
high-speed on-chip oscillator clock
low-speed on-chip oscillator mode
Enter high-speed clock mode or
Enter low-speed clock mode or
Interrupt handling completed
Stop XIN clock and
In interrupt routine
Interrupt handling
Start XIN clock
VCA20 ← 1
VCA20 ← 0
(Note 1)
32. Reducing Power Consumption
(2)
(2, 3)
If it is necessary to start
the high-speed clock or
high-speed on-chip oscillator
during the interrupt routine,
execute steps (6) to (7)
in the routine.
If the high-speed clock or
high-speed on-chip oscillator
starts during the interrupt
routine, execute steps (1) to
(3) at the end of the routine.