R5F21244SNFP#U0 Renesas Electronics America, R5F21244SNFP#U0 Datasheet - Page 98

• Manufacturer Part Number: R5F21244SNFP#U0
• Description: IC R8C MCU FLASH 16K 52LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/24r

Specifications of R5F21244SNFP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K 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: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 10.6
High-Speed On-Chip Oscillator Control Register 2
High-Speed On-Chip Oscillator Control Register 4
High-Speed On-Chip Oscillator Control Register 6
High-Speed On-Chip Oscillator Control Register 7
b7 b6 b5 b4 b3 b2 b1 b0
NOTE:
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
0
1. Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the FRA2 register.
0 0 0 0
Feb 29, 2008
Registers FRA2, FRA4, FRA6 and FRA7
Stores data for frequency correction w hen VCC = 2.7 to 5.5 V. (The value is the same as that
of the FRA1 register after a reset.) Optimal frequency correction to match the voltage
conditions can be achieved by transferring this value to the FRA1 register.
Stores data for frequency correction w hen VCC = 2.2 to 5.5 V. Optimal frequency correction
to match the voltage conditions can be achieved by transferring this value to the FRA1
register.
36.864 MHz frequency correction data is stored.
The oscillation frequency of the high-speed on-chip oscillator can be adjusted to 36.864 MHz
by transferring this value to the FRA1 register.
Bit Symbol
(b7-b3)
Symbol
FRA20
FRA21
FRA22
Symbol
Symbol
Symbol
FRA2
FRA4
FRA6
FRA7
Page 79 of 485
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High-speed on-chip oscillator
frequency sw itching bits
Reserved bits
Address
Bit Name
Address
Address
Address
0025h
0029h
002Bh
002Ch
(1)
Function
Function
Function
Selects the dividing ratio for the high-
speed on-chip oscillator clock.
b2 b1 b0
0 0 0: Divide-by-2 mode
0 0 1: Divide-by-3 mode
0 1 0: Divide-by-4 mode
0 1 1: Divide-by-5 mode
1 0 0: Divide-by-6 mode
1 0 1: Divide-by-7 mode
1 1 0: Divide-by-8 mode
1 1 1: Divide-by-9 mode
Set to 0.
When Shipping
When Shipping
When Shipping
After Reset
After Reset
After Reset
After Reset
Function
00h
10. Clock Generation Circuit
RW
RW
RW
RW
RW
RW
RW
RW
RO
RO
RO