R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 98

• 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

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
Figure 10.5
High-Speed On-Chip Oscillator Control Register 0
High-Speed On-Chip Oscillator Control Register 1
b7 b6 b5 b4
NOTES:
b7
NOTES:
0 0 0 0
1.
2.
3.
1.
2.
Set the PRC0 bit in the PRCR register to 1 (enables w riting) before rew riting to the FRA0 register.
Change the FRA01 bit under the follow ing conditions.
• FRA00 = 1 (high-speed on-chip oscillation)
• The CM14 bit in the CM1 register = 0 (low -speed on-chip oscillator on)
• Bits FRA22 to FRA20 in the FRA2 register
When setting the FRA01 bit to 0 (selects low -speed on-chip oscillator), do not set the FRA00 bit to 0 (40MHz on-chip
oscillator off) at the same time.
Set the FRA00 bit to 0 after setting the FRA01 bit to 0.
Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting to the FRA1 register.
When adjusting the FRA1 register, set the value of the FRA1 register to 40 MHz and below .
When changing the values of the FRA1 register, adjust the FRA1 register so that the frequency of the high-speed
on-chip oscillator clock w ill be 40 MHz or less.
All divide ratio mode settings are supported w hen VCC = 3.0 V to 5.5 V (D, J version)
Divide ratio of 4 or more w hen VCC = 2.7 V to 5.5 V and K version
b3 b2 b1 b0
0 0
Registers FRA0 and FRA1
b0
The frequency of high-speed on-chip oscillator is adjusted w ith bits 0 to 7.
High-speed on-chip oscillator frequency = 40 MHz (FRA1 register = value w hen shipping)
Set the value of the FRA1 register to smaller, the frequency w ill be higher
Set the value of the FRA1 register to larger, the frequency w ill be low er
Bit Symbol
(b7-b2)
Symbol
FRA00
FRA01
Symbol
FRA0
FRA1
Page 76 of 501
—
High-speed on-chip oscillator enable
bit
High-speed on-chip oscillator select
bit
Reserved bits
(2)
Address
Bit Name
Address
0023h
0024h
(1)
(1)
Function
0 : High-speed on-chip oscillator off
1 : High-speed on-chip oscillator on
0 : Selects low -speed on-chip oscillator
1 : Selects high-speed on-chip oscillator
Set to 0
When Shipping
After Reset
After Reset
Function
00h
(2)
10. Clock Generation Circuit
010b to 111b
000b to 111b
(3)
RW
RW
RW
RW
RW
RW