HD64336901G Renesas Technology, HD64336901G Datasheet - Page 97

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

5.2.3
RCTRMDR stores the trimming data of the internal RC oscillator frequency.
Note:
5.2.4
CKCSR selects the port C function, controls switching the system clocks, and indicates the system
clock state.
Bit
3 to 0
Bit
7
6
5
4
3
2
1
0
Bit
7
6
* These values are initialized while loading the trimming data from the flash memory in
RC Trimming Data Register (RCTRMDR)
Clock Control/Status Register (CKCSR)
Bit Name
Bit Name
TRMD7
TRMD6
TRMD5
TRMD4
TRMD3
TRMD2
TRMD1
TRMD0
Bit Name
PMRC1
PMRC0
the flash memory version.
Initial
Value
All 1
Initial
Value
(0)*
(0)*
(0)*
(0)*
(0)*
(0)*
0
0
Initial
Value
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
R/W
Description
Port C Function Select 1 and 2
PMRC1 PMRC0 PC1
0
1
0
1
Description
Reserved
These bits are always read as 1
Description
Trimming Data
In the flash memory version, the trimming data is loaded
from the flash memory to this register right after a reset.
These bits are always read as undefined value.
As for the masked ROM version (under planning), the
internal RC oscillator frequency can be trimmed by
rewriting these bits. The frequency generated in the
internal RC oscillator changes right after rewriting these
bits. These bits are initialized to H'00.
Frequency variation is expressed as follows (the TRMD7
bit is a sign bit):
(Min.) H'80
0
0
1
1
H'FC
I/O
CLKOUT I/O
I/O
OSC2
H'00
Rev. 1.00, 11/03, page 69 of 376
PC0
I/O
OSC1 (external clock input)
OSC1
H'04
H'7C (Max.)