R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 82

• Manufacturer Part Number: R5F211B1SP#U0
• Description: IC R8C MCU FLASH 4K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/1Br

Specifications of R5F211B1SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
Figure 10.6
High-Speed On-Chip Oscillator Control Register 1
High-Speed On-Chip Oscillator Control Register 2
b7 b6 b5 b4 b3 b2 b1 b0
NOTE :
b7 b6 b5 b4 b3 b2 b1 b0
NOTES :
1.
2. Adjust the HRA1 register so that the frequency of the high-speed on-chip oscillator w ill be the maximum value or
1. Set the PRC0 bit in the PRCR register to 1 (w rite enable) bef ore rew riting the HRA2 register.
2.
3.
4.
5. Set the HRA20 and HRA21 bits so that the f requency of the high-speed on-chip oscillator w ill be the maximum value
Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the HRA1 register.
less of the system clock.
High-speed on-chip oscillator f requency = 8 MHz (HRA1 register = value w hen shipping)
If f RING-f ast mode 0 is sw itched to f RING-f ast mode 1, the f requency is multiplied by 1.5.
If f RING-f ast mode 0 is sw itched to f RING-f ast mode 2, the f requency is multiplied by 0.5.
or less of the system clock.
Dec 08, 2006
0 0 0
Registers HRA1 and HRA2
The frequency of the high-speed on-chip oscillator is adjusted w ith bits 0 to 7.
High-speed on-chip oscillator frequency = 8 MHz
(HRA1 register = value w hen shipping ; fRING-fast mode 0)
Setting the HRA1 register to a low er value (minimum value: 00h), results in a higher
frequency.
Setting the HRA1 register to a higher value (maximum value: FFh), results in a low er
frequency.
Bit Symbol
(b4-b2)
(b7-b5)
Symbol
Symbol
HRA20
HRA21
HRA1
HRA2
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High-speed on-chip oscillator mode
select bits
Reserved bits
Nothing is assigned. If necessary, set to 0.
When read, the content is 0.
(5)
Address
Address
Bit Name
0021h
0022h
(1)
(1)
Function
b1 b0
0 0 : f RING-f ast mode 0
0 1 : f RING-f ast mode 1
1 0 : f RING-f ast mode 2
1 1 : Do not set.
Set to 0.
When Shipping
After Reset
Af ter Reset
Function
00h
10. Clock Generation Circuit
(2)
(3)
(4)
(2)
RW
RW
RW
RW
RW
RW
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