R5F21275SNFP#U0 Renesas Electronics America, R5F21275SNFP#U0 Datasheet - Page 111

IC R8C/27 MCU FLASH 32LQFP

R5F21275SNFP#U0

Manufacturer Part Number
R5F21275SNFP#U0
Description
IC R8C/27 MCU FLASH 32LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/27r
Datasheet

Specifications of R5F21275SNFP#U0

Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
LED, POR, Voltage Detect, WDT
Number Of I /o
25
Program Memory Size
24KB (24K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
2.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
32-LQFP
For Use With
R0K521276S000BE - KIT DEV RSK-R8C/26-29R0E521000EPB00 - PROBE EMULATOR FOR PC7501
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-

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R8C/26 Group, R8C/27 Group
Rev.2.10
REJ09B0278-0210
10.4
10.4.1
10.4.2
10.4.3
10.4.4
10.4.5
10.4.6
10.4.7
There are a CPU clock to operate the CPU and a peripheral function clock to operate the peripheral functions. Refer
to Figure 10.1 Clock Generation Circuit.
The system clock is the clock source for the CPU and peripheral function clocks. Either the XIN clock and
XCIN clock or the on-chip oscillator clock can be selected. (For J, K version, the XCIN clock cannot be
selected.)
The CPU clock is an operating clock for the CPU and watchdog timer.
The system clock can be divided by 1 (no division), 2, 4, 8, or 16 to produce the CPU clock. Use the CM06 bit
in the CM0 register and bits CM16 to CM17 in the CM1 register to select the value of the division.
Use the XCIN clock while the XCIN clock oscillation stabilizes.
After reset, the low-speed on-chip oscillator clock divided by 8 provides the CPU clock.
When entering stop mode from high-speed clock mode, the CM06 bit is set to 1 (divide-by-8 mode).
(For J, K version, the XCIN clock cannot be selected.)
The peripheral function clock is the operating clock for the peripheral functions.
The clock fi (i = 1, 2, 4, 8, and 32) is generated by the system clock divided by i. The clock fi is used for timers
RA, RB, RC, and RE, the serial interface and the 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 stop.
fOCO is an operating clock for the peripheral functions.
fOCO runs at the same frequency as the on-chip oscillator clock and can be used as the source for timer RA.
When the WAIT instruction is executed, the clocks fOCO does not stop.
fOCO40M is used as the count source for timer RC. fOCO40M is generated by the high-speed on-chip
oscillator and supplied by setting the FRA00 bit to 1.
When the WAIT instruction is executed, the clock fOCO40M does not stop.
fOCO40M can be used with supply voltage VCC = 3.0 to 5.5 V.
fOCO-F is used as the count source for the A/D converter. fOCO-F is generated by the high-speed on-chip
oscillator and supplied by setting the FRA00 bit to 1.
When the WAIT instruction is executed, the clock fOCO-F does not stop.
fOCO-S is an operating clock for the watchdog timer and voltage detection circuit. fOCO-S is supplied by
setting the CM14 bit to 0 (low-speed on-chip oscillator on) and uses the clock generated by the low-speed on-
chip oscillator. When the WAIT instruction is executed or in count source protect mode of the watchdog timer,
fOCO-S does not stop.
CPU Clock and Peripheral Function Clock
Sep 26, 2008
System Clock
CPU Clock
Peripheral Function Clock (f1, f2, f4, f8, and f32)
fOCO
fOCO40M
fOCO-F
fOCO-S
Page 92 of 453
10. Clock Generation Circuit

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