HD64336901G Renesas Technology, HD64336901G Datasheet - Page 95
HD64336901G
Manufacturer Part Number
HD64336901G
Description
(HD64xxx Series) 16-BIT MICROCONTROLLER
Manufacturer
Renesas Technology
Datasheet
1.HD64336901G.pdf
(408 pages)
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5.2
Clock oscillators are controlled by the following registers.
5.2.1
RCCR controls the internal RC oscillator.
Bit
7
6
5
4 to 2
1
0
RC control register (RCCR)
RC trimming data protect register (RCTRMDPR)
RC trimming data register (RCTRMDR)
Clock control/status register (CKCSR)
Register Descriptions
RC Control Register (RCCR)
Bit Name
RCSTP
FSEL
VCLSEL
RCPSC1
RCPSC0
Initial
Value
0
0
0
All 0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
Description
Internal RC Oscillator Standby
The internal RC oscillator standby state is entered by
setting this bit to 1.
0: 8MHz
1: 10MHz
Power Supply Select for Internal RC Oscillator
0: Selects VBGR
1: Selects VCL
When VCL is selected, the accuracy of the internal RC
oscillator frequency cannot be guaranteed.
Reserved
These bits are always read as 0
Division Ratio Select for Internal RC Oscillator
The division ratio of
bit.
These bits can be written to only when the CKSTA bit in
CKCSR is 0.
0X:
10:
11:
Frequency Select for Internal RC Oscillator
RC
RC
RC
/2
/4
(not divided)
RC
changes right after rewriting this
Rev. 1.00, 11/03, page 67 of 376
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