R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 101

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
Figure 10.13
Table 10.6
Oscillation Stop Detection
((a) or (b))
Watchdog Timer
Voltage Monitor 2
Generated Interrupt Source
Voltage Monitor 1, and Voltage Monitor 2 Interrupts
Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN
Clock
Determining Interrupt Source for Oscillation Stop Detection, Watchdog Timer,
No
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Set OCD1 to OCD0 bits to 00b
(a) OCD3 bit in OCD register = 1
(b) OCD1 to OCD0 bits in OCD register = 11b and the OCD2 bit = 1
VW2C3 bit in VW2C register = 1
VW2C2 bit in VW2C register = 1
that the OCD bit is 0 (XIN clock
Determine several times
Switch to XIN clock
(select XIN Clock)
Set OCD2 bit to 0
oscillates)
End
Yes
Bit Showing Interrupt Cause
OCD3 to OCD0 bits: Bits in OCD register
10. Clock Generation Circuit