R5F21272SNFP#U0 Renesas Electronics America, R5F21272SNFP#U0 Datasheet - Page 109

IC R8C/27 MCU FLASH 32LQFP

R5F21272SNFP#U0

Manufacturer Part Number
R5F21272SNFP#U0
Description
IC R8C/27 MCU FLASH 32LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/27r
Datasheet

Specifications of R5F21272SNFP#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
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 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
10.2
10.2.1
10.2.2
These clocks are supplied by the on-chip oscillators (high-speed on-chip oscillator and a low-speed on-chip
oscillator). The on-chip oscillator clock is selected by the FRA01 bit in the FRA0 register.
The clock generated by the low-speed on-chip oscillator is used as the clock source for the CPU clock,
peripheral function clock, fOCO, and fOCO-S.
After reset, the on-chip oscillator clock generated by the low-speed on-chip oscillator divided by 8 is selected as
the CPU clock.
If the XIN clock stops oscillating when bits OCD1 to OCD0 in the OCD register are set to 11b, the low-speed
on-chip oscillator automatically starts operating, supplying the necessary clock for the MCU.
The frequency of the low-speed on-chip oscillator varies depending on the supply voltage and the operating
ambient temperature. Application products must be designed with sufficient margin to allow for frequency
changes.
The clock generated by the high-speed on-chip oscillator is used as the clock source for the CPU clock,
peripheral function clock, fOCO, fOCO-F, and fOCO40M.
To use the high-speed on-chip oscillator clock as the clock source for the CPU clock, peripheral clock, fOCO,
and fOCO-F, set bits FRA20 to FRA22 in the FRA2 register as follows:
After reset, the on-chip oscillator clock generated by the high-speed on-chip oscillator stops. Oscillation is
started by setting the FRA00 bit in the FRA0 register to 1 (high-speed on-chip oscillator on). The frequency can
be adjusted by registers FRA1 and FRA2.
The frequency correction data (the value is the same as that of the FRA1 register after a reset) corresponding to
the supply voltage ranges VCC = 2.7 to 5.5 V is stored in FRA4 register. Furthermore, the frequency correction
data corresponding to the supply voltage ranges VCC = 2.2 to 5.5 V is stored in FRA6 register (for N, D version
only). To use separate correction values to match these voltage ranges, transfer them from FRA4 or FRA6
register to the FRA1 register.
The frequency correction data of 36.864 MHz is stored in the FRA7 register (for N, D version only). To set the
frequency of the high-speed on-chip oscillator to 36.864 MHz, transfer the correction value in the FRA7
register to the FRA1 register before use. This enables the setting errors of bit rates such as 9600 bps and 38400
bps to be 0% when the serial interface is used in UART mode (refer to Table 15.7 Bit Rate Setting Example in
UART Mode (Internal Clock Selected)).
Since there are differences in the amount of frequency adjustment among the bits in the FRA1 register, make
adjustments by changing the settings of individual bits. Adjust the FRA1 register so that the frequency of the
high-speed on-chip oscillator clock will be 40 MHz or less.
• All divide ratio mode settings are supported when VCC = 3.0 to 5.5 V
• Divide ratio of 4 or more when VCC = 2.7 to 5.5 V or K version
• Divide ratio of 8 or more when VCC = 2.2 to 5.5 V (for N, D version only) 110b to 111b
On-Chip Oscillator Clocks
Sep 26, 2008
Low-Speed On-Chip Oscillator Clock
High-Speed On-Chip Oscillator Clock
Page 90 of 453
010b to 111b
000b to 111b
(other than K version)
10. Clock Generation Circuit

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