R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 102
![IC R8C/23 MCU FLASH 48-LQFP](/photos/12/38/123822/r5f21238dfp_u0_sml.jpg)
R5F21238DFP#U0
Manufacturer Part Number
R5F21238DFP#U0
Description
IC R8C/23 MCU FLASH 48-LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/23r
Specifications of R5F21238DFP#U0
Core Size
16/32-Bit
Program Memory Size
64KB (64K x 8)
Peripherals
POR, Voltage Detect, WDT
Core Processor
R8C
Speed
20MHz
Connectivity
CAN, I²C, LIN, SIO, SSU, UART/USART
Number Of I /o
41
Program Memory Type
FLASH
Ram Size
3K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-LQFP
No. Of I/o's
41
Ram Memory Size
3KB
Cpu Speed
20MHz
No. Of Timers
4
Digital Ic Case Style
LQFP
Embedded Interface Type
CAN, I2C, UART
Rohs Compliant
Yes
Cpu Family
R8C
Device Core Size
16b
Frequency (max)
20MHz
Interface Type
I2C/UART
Total Internal Ram Size
3KB
# I/os (max)
41
Number Of Timers - General Purpose
5
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
On-chip Adc
12-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
48
Package Type
LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
Eeprom Size
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
- Current page: 102 of 551
- Download datasheet (6Mb)
R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
10.2
10.2.1
10.2.2
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 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 by divide-by-8 is
selected for the CPU clock.
If the XIN clock stops oscillating when the OCD1 to OCD0 bits 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. The application products must be designed with sufficient margin to accommodate the
frequency range.
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 of the CPU clock, peripheral clock, fOCO,
and fOCO-F, set bits FRA20 to FRA22 in the FRA2 register as follows;
All divide ratio mode settings are supported when VCC = 3.0 V to 5.5 V (D, J version)000b to 111b
Divide ratio of 4 or more when VCC = 2.7 V to 5.5 V and K version
After reset, the on-chip oscillator clock generated by the high-speed on-chip oscillator stops. The oscillation
starts by setting the FRA00 bit in the FRA0 register to 1 (high-speed on-chip oscillator on). The frequency can
be adjusted by the FRA1 and FRA2 registers.
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 amount of high-speed on-chip oscillator frequency to 40 MHz and below by setting the FRA1
register.
On-Chip Oscillator Clocks
Low-Speed On-Chip Oscillator Clock
High-Speed On-Chip Oscillator Clock
Page 80 of 501
10. Clock Generation Circuit
010b to 111b
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