R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 176
R5F21346CNFP#U0
Manufacturer Part Number
R5F21346CNFP#U0
Description
MCU 1KB FLASH 32K ROM 48-LQFP
Manufacturer
Renesas Electronics America
Series
R8C/3x/34Cr
Datasheet
1.R5F21346CNFPU0.pdf
(759 pages)
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
-
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R8C/34C Group
REJ09B0586-0100 Rev.1.00 Jan 13, 2010
Page 143 of 723
9.8.1
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The oscillation stop detection interrupt shares a vector with the voltage monitor 1 interrupt, the voltage
monitor 2 interrupt, and the watchdog timer interrupt. To use the oscillation stop detection interrupt and
watchdog timer interrupt, the interrupt source needs to be determined.
Table 9.7 lists the Determination of Interrupt Sources for Oscillation Stop Detection, Watchdog Timer,
Voltage Monitor 1, or Voltage Monitor 2 Interrupt. Figure 9.11 shows an Example of Determining Interrupt
Sources for Oscillation Stop Detection, Watchdog Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt.
When the XIN clock restarts after oscillation stop, switch the XIN clock to the clock source for the CPU clock
and the peripheral functions by a program.
Figure 9.10 shows the Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN
Clock.
To enter wait mode while the oscillation stop detection function is used, set the CM02 bit to 0 (peripheral
function clock does not stop in wait mode).
Since the oscillation stop detection function is a function for cases where the XIN clock is stopped by an
external cause, set bits OCD1 to OCD0 to 00b to stop or start the XIN clock by a program (select stop mode or
change the CM05 bit).
This function cannot be used when the XIN clock frequency is below 2 MHz. In this case, set bits OCD1 to
OCD0 to 00b.
To use the low-speed on-chip oscillator clock as the clock source for the CPU clock and the peripheral
functions after detecting the oscillation stop, set the FRA01 bit in the FRA0 register to 0 (low-speed on-chip
oscillator selected) and bits OCD1 to OCD0 to 11b.
To use the high-speed on-chip oscillator clock as the clock source for the CPU clock and the peripheral
functions after detecting the oscillation stop, first set the FRA00 bit to 1 (high-speed on-chip oscillator
oscillates) and the FRA01 bit to 1 (high-speed on-chip oscillator selected). Then set bits OCD1 to OCD0 to
11b.
How to Use Oscillation Stop Detection Function
9. Clock Generation Circuit
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