HD64F3687GHV Datasheet, PDF (108/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 5 Clock Pulse Generator
5.2.2 RC Trimming Data Protect Register (RCTRMDPR)
RCTRMDPR controls RCTRMDPR itself and writing to RCTRMDR. Use the MOV instruction to
rewrite this register. Bit manipulation instruction cannot change the settings.
Initial
Bit
Bit Name Value R/W Description
7
WRI
1
W
Write Inhibit
Only when writing 0 to this bit, this register can be written
to. This bit is always read as 1.
6
PRWE 0
R/W Protect Information Write Enable
Bits 5 and 4 can be written to when this bit is set to 1.
[Setting condition]
• When writing 0 to the WRI bit and writing 1 to the
PRWE bit
[Clearing conditions]
• Reset
• When writing 0 to the WRI bit and writing 0 to the
PRWE bit
5
LOCKDW 0
R/W Trimming Data Register Lock Down
The RC trimming data register (RCTRMDR) cannot be
written to when this bit is set to 1. Once this bit is set to 1,
this register cannot be written to until a reset is input even
if 0 is written to this bit.
[Setting condition]
• When writing 0 to the WRI bit and writing 1 to the
LOCKDW bit while the PRWE bit is 1
[Clearing condition]
• Reset
Rev. 3.00 Sep. 10, 2007 Page 74 of 528
REJ09B0216-0300