R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 93

• Manufacturer Part Number: R5F211B1SP#U0
• Description: IC R8C MCU FLASH 4K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/1Br

Specifications of R5F211B1SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
Figure 10.11
Table 10.6
Oscillation stop detection
( (a) or (b) )
Watchdog timer
Voltage monitor 2
Generated Interrupt Source
Dec 08, 2006
Voltage Monitor 2 Interrupts
Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to Main
Clock
Determining Interrupt Source for Oscillation Stop Detection, Watchdog Timer, and
(oscillation stop detection function
Set bits OCD1 to OCD0 to 00b
Page 75 of 315
Determine OCD3 bit
Switch to main clock
Judge several times
(select main clock)
Set OCD2 bit to 0
(a) OCD3 bit in OCD register = 1
(b) Bits OCD1 to OCD0 in OCD register = 11b and OCD2 bit = 1
VW2C3 bit in VW2C register = 1
VW2C2 bit in VW2C register = 1
disabled)
End
0 (main clock oscillates)
Determine several times that the main clock is supplied
1(main clock stops)
Bits OCD3 to OCD0: Bits in OCD register
Bit Showing Interrupt Cause
10. Clock Generation Circuit