r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 121

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
9.2.6
9.2.7
Notes:
After Reset
After Reset
1. Set the FRA01 bit under the following conditions:
2. When writing 0 (low-speed on-chip oscillator selected) to the FRA01 bit, do not write 0 (high-speed on-chip
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 00010h
Address 00012h
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the CPSR register.
• FRA00 bit = 1 (high-speed on-chip oscillator on)
• CM14 bit in the CM1 register = 0 (low-speed on-chip oscillator on)
• Bits FRA22 to FRA20 in the FRA2 register:
oscillator off) to the FRA00 bit at the same time. After the FRA01 bit is set to 0, set the FRA00 bit to 0.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA0 register.
Symbol
Symbol
All division modes can be set when VCC = 2.7 to 5.5 V: 000b to 111b
Division ratio of 8 or more when VCC = 1.8 to 5.5 V: 110b (divide-by-8 mode), 111b (divide-by-9 mode)
Symbol
Bit
Bit
FRA00
FRA01
FRA03
Symbol
CPSR
Clock Prescaler Reset Flag (CPSRF)
High-Speed On-Chip Oscillator Control Register 0 (FRA0)
—
—
—
—
—
—
—
—
—
—
—
—
Preliminary document
Specifications in this document are tentative and subject to change.
CPSR
b7
b7
—
0
0
High-speed on-chip oscillator enable
bit
fOCO clock source select bit
Reserved
Nothing is assigned. The write value must be 0. The read value is 0.
fOCO128 clock select bit
Nothing is assigned. The write value must be 0. The read value is 0.
Clock prescaler reset bit
b6
b6
—
—
0
0
Bit Name
Bit Name
b5
b5
—
—
0
0
(1)
b4
b4
—
—
0
0
FRA03
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: fLOCO divided by 128 selected
1: fHOCO-F divided by 128 selected
b3
b3
—
When this bit is set to 1, the clock prescaler is
initialized (the read value is 0).
0
0
b2
b2
—
—
0
0
FRA01
Function
Function
b1
—
b1
0
0
9. Clock Generation Circuit
FRA00
b0
b0
—
0
0
(2)
Page 90 of 725
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
—