R5F21162SP#U0 Renesas Electronics America, R5F21162SP#U0 Datasheet - Page 62

• 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
9.3
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
There are two type clocks: a CPU clock to operate the CPU and a peripheral function clock to operate
the peripheral functions. Refer to Figure 9.1 Clock Generation Circuit.
The system clock is a clock source for the CPU and peripheral function clocks. The main clock or on-
chip oscillator clock can be selected.
The CPU clock is an operating clock for the CPU and watchdog timer.
The system clock can be the divide-by-1 (no division), 2, 4, 8 or 16 to produce the CPU clock. Use
the CM06 bit in the CM0 register and the CM16 to CM17 bits in the CM1 register to select the value
of the division.
After reset, the low-speed on-chip oscillator clock divided-by-8 provides the CPU clock.
When entering stop mode from high-speed or medium-speed mode, the CM06 bit is set to “1”
(divide-by-8 mode).
The peripheral function clock is operating clock for the peripheral functions.
The clock fi (i=1, 2, 4, 8, 32) is generated by the system clock divided-by-i. The clock fi is used for
timers X, Y, Z, C, serial interface and A/D converter.
When the WAIT instruction is executed after setting the CM02 bit in the CM0 register to “1”
(peripheral function clock stops in wait mode), the clock fi stops.
fRING and fRING128 are operating clocks for the peripheral functions.
The fRING runs at the same frequency as the on-chip oscillator clock and can be used as the source
for the timer X. The fRING128 is generated by the fRING by dividing it by 128 and can be used for
the timer C.
When the WAIT instruction is executed, the clocks fRING and fRING128 do not stop.
fRING-fast is used as the count source for the timer C. The fRING-fast is generated by the high-
speed on-chip oscillator and provided by setting the HRA00 bit to “1”.
When the WAIT instruction is executed, the clock fRING-fast does not stop.
fRING-S is an operating clock for the watchdog timer and voltage detection circuit. When setting the
CM14 bit to “0” (low-speed on-chip oscillator on) using the clock generated by the low-speed on-chip
oscillator, the fRING-S can be provided. When the WAIT instruction is executed or in count source
protect mode of the watchdog timer, fRING-S does not stop.
CPU Clock and Peripheral Function Clock
Jan 19, 2006
System Clock
CPU Clock
Peripheral Function Clock (f1, f2, f4, f8, f32)
fRING and fRING128
fRING-fast
fRING-S
Page 47 of 254
9. Clock Generation Circuit