Datasheet

Section 5 Clock Pulse Generators
Rev. 1.50 Sep. 18, 2007 Page 75 of 584
REJ09B0240-0150
Bit Bit Name
Initial
Value R/W Description
4 TRMDRWE 0 R/W Trimming Date Register Write Enable
This register can be written to when the LOCKDW bit is 0
and this bit is 1.
[Setting condition]
• When writing 0 to the WRI bit and writing 1 to the
TRMDRWE bit while the PRWE bit is 1.
[Clearing conditions]
• Reset
• When writing 0 to the WRI bit and writing 0 to the
TRMDRWE bit while the PRWE bit is 1.
3 to 0  All 1  Reserved
These bits are always read as 1.
5.2.3 RC Trimming Data Register (RCTRMDR)
RCTRMDR stores the trimming data of the on-chip oscillator frequency.
Bit Bit Name
Initial
Value R/W Description
7 TRMD7 (0)* R/W
6 TRMD6 (0)* R/W
5 TRMD5 (0)* R/W
4 TRMD4 (0)* R/W
3 TRMD3 (0)* R/W
2 TRMD2 (0)* R/W
1 TRMD1 (0)* R/W
0 TRMD0 (0)* R/W
Trimming Data
The trimming data is loaded to this register right after a
reset. The read data from these bits is always undefined.
The on-chip oscillator frequency can be trimmed by
rewriting these bits. The frequency of the on-chip
oscillator changes right after rewriting these bits. These
bits are initialized to H'00.
Changes in frequency are shown below (bit 7 is a sign
bit):
(Min.) H'80 ← H'FF ← H'00 →H'01 → H'7F (Max.)
Note: * These values are initialized while loading the trimming data.