R5F21162SP#U0 Renesas Electronics America, R5F21162SP#U0 Datasheet - Page 61

• Manufacturer Part Number: R5F21162SP#U0
• Description: IC R8C MCU FLASH 8K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/16r

Specifications of R5F21162SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 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: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/16 Group, R8C/17 Group
Rev.2.10
REJ09B0169-0210
9.2
9.2.1
9.2.2
This clock is supplied by an on-chip oscillator. The on-chip oscillator contains a high-speed on-chip
oscillator and a low-speed on-chip oscillator. Either an on-chip oscillator clock is selected by the HRA01
bit in the HRA0 register.
The clock generated by the low-speed on-chip oscillator is used as the clock source for the CPU
clock, peripheral function clock, fRING, fRING128 and fRING-S.
After reset, the on-chip oscillator clock generated by the low-speed on-chip oscillator by divide-by-8
is selected for the CPU clock.
If the main clock stops oscillating when the OCD1 to OCD0 bits in the OCD register are set to “11b”
(oscillation stop detection function enabled), the low-speed on-chip oscillator automatically starts
operating, supplying the necessary clock for the microcomputer.
The frequency of the low-speed on-chip oscillator varies depending on the supply voltage and the
operating ambient temperature. The application products must be designed with sufficient margin for
the frequency change.
The clock generated by the high-speed on-chip oscillator is used as the clock source for the CPU
clock, peripheral function clock, fRING, fRING128, and fRING1-fast.
After reset, the on-chip oscillator clock generated by the high-speed on-chip oscillator stops. The
oscillation starts by setting the HRA00 bit in the HRA0 register to “1” (high-speed on-chip oscillator
on). The frequency can be adjusted by the HRA1 and HRA2 registers.
Since the difference in delay between the bits, adjust by changing each bit.
On-Chip Oscillator Clock
Jan 19, 2006
Low-Speed On-Chip Oscillator Clock
High-Speed On-Chip Oscillator Clock
Page 46 of 254
9. Clock Generation Circuit