r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 150

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
9.2.6
Notes:
9.2.7
b7-b0 The frequency of the high-speed on-chip oscillator can be adjusted by setting as follows:
1. Change the FRA01 bit in the following conditions.
2. When setting the FRA01 bit to 0 (low-speed on-chip oscillator selected), do not set the FRA00 bit to 0 (high-
3. When setting the FRA01 bit to be 1 (high-speed on-chip oscillator selected) and stopping the low-speed on-chip
After Reset
After Reset
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Bit
Address 0023h
Address 0024h
• FRA00 = 1 (high-speed on-chip oscillator on)
• The CM14 bit in the CM1 register = 0 (low-speed on-chip oscillator on)
• Bits FRA22 to FRA20 in the FRA2 register:
speed on-chip oscillator off) at the same time. Set the FRA00 bit to 0 after setting the FRA01 bit to 0.
oscillator, wait for one or more cycles of the low-speed on-chip oscillator and then set the CM14 bit in the CM1
register to 1 (low-speed on-chip oscillator off)
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA0 register.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA1 register.
Also, rewrite the FRA1 register when the FRA00 bit in the FRA0 register is set 0 (high-speed on-chip oscillator
off).
Symbol
Symbol
All division mode can be set when VCC = 2.7 V to 5.5 V 000b to 111b
Divide ratio of 8 or more when VCC = 1.8 V to 5.5 V
40 MHz:
36.864 MHz: Transfer the value in the FRA4 register to the FRA1 register and the value in
32 MHz:
Symbol
FRA00 High-speed on-chip oscillator enable bit
FRA01 High-speed on-chip oscillator select bit
FRA03
Bit
Bit
High-Speed On-Chip Oscillator Control Register 0 (FRA0)
High-Speed On-Chip Oscillator Control Register 1 (FRA1)
—
—
—
—
—
b7
b7
—
—
0
Reserved bit
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
fOCO128 clock select bit
FRA1 = value after reset, FRA3 = value after reset
the FRA5 register to the FRA3 register.
Transfer the value in the FRA6 register to the FRA1 register and the value in
the FRA7 register to the FRA3 register.
b6
b6
—
—
0
Bit Name
b5
—
b5
—
0
When shipping
Function
b4
b4
—
—
0
FRA03
(1)
b3
b3
—
0
0: High-speed on-chip oscillator off
1: High-speed on-chip oscillator on
0: Low-speed on-chip oscillator selected
1: High-speed on-chip oscillator selected
Set to 0.
0: fOCO-S divided by 128 selected
1: fOCO-F divided by 128 selected
110b to 111b (divide-by-8 or more)
b2
b2
—
—
0
FRA01
Function
b1
b1
—
0
9. Clock Generation Circuit
FRA00
b0
b0
—
0
R/W
R/W
Page 118 of 740
(2)
(3)
R/W
R/W
R/W
R/W
R/W
—