R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 87

• 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
10.4.2
10.4.1.1
10.4.1.2
10.4.1.3
10.4.2.1
10.4.2.2
10.4.2.3
The main clock divided by 1 (no division) provides the CPU clock. If the CM14 bit is set to 0 (low-speed on-
chip oscillator on) or the HRA00 bit in the HRA0 register is set to 1 (high-speed on-chip oscillator on), fRING
and fRING128 can be used as timers X and C. When the HRA00 bit is set to 1, fRING-fast can be used as timer
C. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fRING-S can be used for the watchdog
timer and voltage detection circuit.
The main clock divided by 2, 4, 8, or 16 provides the CPU clock. If the CM14 bit is set to 0 (low-speed on-chip
oscillator on) or the HRA00 bit in the HRA0 register is set to 1 (high-speed on-chip oscillator on), fRING and
fRING128 can be used as timers X and C. When the HRA00 bit is set to 1, fRING-fast can be used as timer C.
When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fRING-S can be used for the watchdog timer
and voltage detection circuit.
The on-chip oscillator clock divided by 1 (no division), 2, 4, 8, or 16 provides the CPU clock. The on-chip
oscillator clock is also the clock source for the peripheral function clocks. When the HRA00 bit is set to 1,
fRING-fast can be used as timer C. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fRING-S
can be used for the watchdog timer and voltage detection circuit.
Since the CPU clock stops in wait mode, the CPU which operates using the CPU clock and the watchdog timer
when count source protection mode is disabled stop. The main clock and on-chip oscillator clock do not stop
and the peripheral functions using these clocks continue operating.
If the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the f1, f2, f4, f8, and f32 clocks stop
in wait mode. This reduces power consumption.
The MCU enters wait mode when the WAIT instruction is executed.
The status before wait mode was entered is maintained.
Dec 08, 2006
Wait Mode
High-Speed Mode
Medium-Speed Mode
High-Speed and Low-Speed On-Chip Oscillator Modes
Peripheral Function Clock Stop Function
Entering Wait Mode
Pin Status in Wait Mode
Page 69 of 315
10. Clock Generation Circuit