OPERATIONAL MODES CALIBRATION OF TIMERS In c" />
參數(shù)資料
型號: KIT33975AEWEVBE
廠商: Freescale Semiconductor
文件頁數(shù): 11/32頁
文件大?。?/td> 0K
描述: KIT EVALUATION FOR MC33975
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,開關(guān)探測
嵌入式:
已用 IC / 零件: MC33975
主要屬性: 8 可編程輸入(電池開關(guān)或接地開關(guān))
次要屬性: 14 開關(guān)至接地輸入
已供物品: 板,CD
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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 13). After the 33975 device
receives the calibration command, the device expects 512
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
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. All reset conditions clear the
calibration register and places the device in the uncalibrated
state.
RESET
The reset command resets all registers to Power-ON Reset
(POR) state. Refer to Table , page 20, for POR states or the
paragraph entitled Power-ON Reset (POR) on page 16 of
this datasheet.
Table 12. Analog Channel
Bits 43210
Analog Channel Select
00000
No Input Selected
00001
SG0
00010
SG1
00011
SG2
00100
SG3
00101
SG4
00110
SG5
00111
SG6
01000
SG7
01001
SG8
01010
SG9
01011
SG10
01100
SG11
01101
SG12
01110
SG13
01111
SP0
10000
SP1
10001
SP2
10010
SP3
10011
SP4
10100
SP5
10101
SP6
10110
SP7
Table 13. 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
1
0
1
X
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