參數(shù)資料
型號： ADUC7032BSTZ-8V-RL
廠商： Analog Devices Inc
文件頁數(shù)： 99/128頁
文件大?。?/td> 0K
描述： IC BATTERY SENSOR PREC 48-LQFP
標(biāo)準(zhǔn)包裝： 1
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 20.48MHz
連通性： LIN，SPI，UART/USART
外圍設(shè)備： POR，PSM，溫度傳感器，WDT
輸入/輸出數(shù)： 9
程序存儲器容量： 96KB（48K x 16）
程序存儲器類型： 閃存
RAM 容量： 1.5K x 32
電壓 - 電源 (Vcc/Vdd)： 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 2x16b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 105°C
封裝/外殼： 48-LQFP
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： ADUC7032BSTZ-8V-RLDKR
Preliminary Technical Data
ADuC7032
Rev. PrD | Page 72 of 128
ADUC7032 LOW POWER CLOCK CALIBRATION
The low power 131kHz oscillator may be calibrated using either
the precision 131kHz oscillator, or an external 32.768KHz
watch crystal. Two dedicated calibration counters and an
oscillator trim register are used to implement this feature.
One counter, 9-bits wide, is clocked by the accurate clock
oscillator, either the Precision oscillator or external watch
crystal. The second counter, 10-bits wide, is clocked by the low
power oscillator, either directly at 131kHz or via a divide by 4
block generating 32.768kHz. The source for each calibration
counter should be of the same frequency. The trim register
(OSC0TRM) is an 8-bit wide register, the lower 4-bits of which
are user accessible trim bits. Increasing the value in OSC0TRM
will decrease the frequency of the low power oscillator,
decreasing the value will increase the frequency. Based on a
nominal frequency of 131KHz, the typical trim range is
between 127KHz to 135KHz. The OSC0TRIM bits have a
resolution of typically 500Hz per LSB.
The clock calibration mode is configured and controlled by the
following MMRs:
-
OSC0CON:
Control bits for calibration,
-
OSC0STA:
Calibration Status Register
-
OSC0VAL0:
9Bit counter. Counter 0
-
OSC0VAL1:
10Bit counter. Counter 1
-
OSC0TRM:
Oscillator Trim Register
An example calibration routine is shown in Figure 28. User
code configures and enables the calibration sequence via
OSC0CON. When the precision oscillator calibration counter,
OSC0VAL0, reaches 0x1FF, both counters are disabled.
User code then reads back the value of the low power oscillator
calibration counter. There are three possible scenarios:
-
OSC0VAL0 = OSC0VAL1. No Further Action is
required.
-
OSC0VAL0 > OSC0VAL1. The Low Power Oscillator
is running slow. OSC0TRM must be decreased.
-
OSC0VAL0 < OSC0VAL1. The Low Power Oscillator
is running fast. OSC0TRM must be increased.
When the OSC0TRM has been changed the routine should be
re-run and the new frequency checked.
Using the internal precision 131kHz oscillator, it will take
approximately 4milliseconds to execute the calibration routine.
If the external 32.768kHz crystal is used, this time increases to
16milliseconds.
NOTE: Prior to the clock calibration routine been started, it is
required that the user switch to either the precision 131kHz
oscillator or the external 32.768KHz watch crystal as the PLL
Clock Source. If this is note done, it is possible that the PLL will
lose lock each time OSC0TRM is modified. This will increase
the length of time it takes to calibrate the Low Power,
Oscillator.
05
99
4-
0
28
BEGIN
CALIBRATION
ROUTINE
WHILE
OSCSTA[0] = 1
INCREASE
OSC0TRM
DECREASE
OSC0TRM
OSC0VAL0 < OSC0VAL1
OSC0VAL0 > OSC0VAL1
END
CALIBRATION
ROUTINE
IS ERROR WITHIN
DESIRED LEVEL?
OSC0VAL0 = OSC0VAL1
NO
YES
Figure 28 : Example OSC0TRM Calibration Routine
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