參數(shù)資料
型號(hào): MC33972
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Multiple Switch Detection Interface with Suppressed Wake-Up(帶抑制喚醒功能的多開關(guān)檢測(cè)接口)
中文描述: 多交換檢測(cè)接口,具有抑制喚醒(帶抑制喚醒功能的多開關(guān)檢測(cè)接口)
文件頁數(shù): 16/28頁
文件大?。?/td> 819K
代理商: MC33972
33972/D
16
Go to: www.freescale.com
Calibration of Timers
In cases where an accurate time base is required, the user
may calibrate the internal timers using the
calibration command
(refer to
Table 8
)
.
After the 33972 device receives the
calibration command, the device expects 512
μ
s logic [0]
calibration pulse on the
CS
pin. The pulse is used to calibrate
the internal clock. No other SPI pins should transition during this
512
μ
s calibration pulse. Because the oscillator frequency
changes with temperature, calibration is required for an
accurate time base. Calibrating the timers has no affect on the
quiescent current measurement. The calibration command
simply makes the time base more accurate. The
calibration
command
may be used to update the device on a periodic
basis.
Reset
The reset command resets all registers to Power-ON Reset
(POR) state. Refer to
Table 10
, page 17, for POR states or the
paragraph entitled
Power-ON Reset (POR)
on page 12 of this
datasheet.
Table 8. Calibration Command
Calibration Command
Command Bits
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
1
0
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Table 9. Reset Command
Reset Command
Command Bits
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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