參數(shù)資料
型號: ML610Q411-XXXWA
廠商: LAPIS SEMICONDUCTOR CO LTD
元件分類: 微控制器/微處理器
英文描述: RISC MICROCONTROLLER, UUC95
封裝: 2.83 MM X 2.63 MM, 0.35 MM HEIGHT, 0.80 MM PITCH, DIE-95
文件頁數(shù): 15/152頁
文件大?。?/td> 1641K
代理商: ML610Q411-XXXWA
ML610Q411/ML610Q412/ML610Q415 User’s Manual
Chapter 7
Time Base Counter
7 – 9
7.3.3
Low-Speed Time Base Counter Frequency Adjustment Function
Frequency adjustment (Adjustment range: Approx.
488ppm to +488ppm. Adjustment accuracy: Approx. 0.48ppm) is
possible for outputs of T8KHZ to T1HZ of LTBC by using the low-speed time base counter frequency adjust registers
(LTBADJH and LTBADJL).
Table7-1 shows correspondence between the frequency adjustment values (LTBADJH, LTBADJL) and adjustment
ratio.
Table 7-1
Correspondence between Frequency Adjustment Values (LTBADJH, LTBADJL)
and Adjustment Ratio
LADJ10 to 0
Hexadecimal Frequency adjustment ratio (ppm)
0
1
3FFH
+487.80
0
1
0
3FEH
+487.33
:
0
1
003H
+1.43
0
1
0
002H
+0.95
0
1
001H
+0.48
0
000H
0
1
7FFH
0.48
1
0
7FEH
0.95
:
1
0
1
401H
487.80
1
0
400H
488.28
The adjustment values (LADJ10 to LADJ0) to be set in LTBADJH and LTBADJL can be obtained by using the
following equations:
Adjustment value
= Frequency adjustment ratio
× 2097152 (decimal)
=
Frequency adjustment ratio
× 200000h (hexadecimal)
Example 1: When adjusting +15.0ppm (gaining time)
Adjustment value
= +15.0ppm
× 2097152 (decimal)
=
+15.0
× 106 × 2097152
=
+31.45728 (decimal)
01Fh (hexadecimal)
Example 2: When adjusting
25.5ppm (losing time)
Adjustment value
=
25.5ppm × 2097152 (decimal)
=
25.5 × 106 × 2097152
=
53.477376 (decimal)
7CCh (hexadecimal)
Note:
The low-speed clock (LSCLK) and the outputs of T32KHZ and T16KHZ of LTBC are not adjusted by the frequency
adjust function.
The frequency adjustment accuracy does not guarantee the accuracy including the frequency variation of the crystal
oscillation (32.768kHz) due to temperature variations.
The function can be utilized on ML610Q411 and ML610Q412 which has the low-speed crystal oscillation clock. It can
not be utilized on ML610Q415 because the ML610Q415 uses 1/16 of 500kHz RC oscillation clock (31.25kHz) for the
low-speed clock (LSCLK), as which frequency has significant temperature variation comparing to the crystal
oscillation.
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