LAPIS Semiconductor ML610471, User Manual, Page: 100 / 281

ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 7 Time Base Counter
7-6
7.2.4 Low-Speed Time Base Counter Frequency Adjustment Registers L and H (LTBADJL,
LTBADJH)
Address: 0F00CH
Access: R/W
Access size: 8/16 bit
Initial value: 00H
7 6 5 4 3 2 1 0
LTBADJL LADJ7 LADJ6 LADJ5 LADJ4 LADJ3 LADJ2 LADJ1 LADJ0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
Address: 0F00DH
Access: R/W
Access size: 8-bit
Initial value: 00H
7 6 5 4 3 2 1 0
LTBADJH ― ― ― ― ― LADJS LADJ9 LADJ8
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
LTBADJL and LTBADJH are special function registers (SFRs) to set the frequency adjustment values of the low-speed
time base clock.
[Description of Bits]
•
LADJS, LADJ9 to LADJ8 (bits 2 to 0) LADJ7-LADJ0 (bits 7 to 0)
The LADJS and LADJ9 to LADJ0 bits are used to adjust frequency.
Adjustment range: approximately -488ppm to +488ppm, Adjustment accuracy: approximately 0.48ppm is
possible. See Section 7.3.3, “Low-Speed Time Base Counter Frequency Adjustment Function” for the
correspondence between the frequency adjustment values (LTBADJH, LTBADJL) and adjustment ratio.