参数资料
型号: EVAL-ADUC7039QSPZ
厂商: Analog Devices Inc
文件页数: 52/92页
文件大小: 0K
描述: BOARD EVAL FOR ADUC7039
设计资源: ADuC7039QSPZ Gerber Files
EVAL-ADuC7039 Schematic & Brd Outline
标准包装: 1
系列: QuickStart™ PLUS 套件
类型: MCU
适用于相关产品: ADuC7039
所含物品:
ADuC7039
Data Sheet
Rev. D | Page 56 of 92
OSCVAL0 Register
Name:
OSCVAL0
Address:
0xFFFF0448
Default Value:
0x00
Access:
Read only
Function:
This 9-bit counter is clocked from the 128 kHz precision oscillator.
OSCVAL1 Register
Name:
OSCVAL1
Address:
0xFFFF044C
Default Value:
0x0000
Access:
Read only
Function:
This 10-bit counter is clocked from the low power, 128 kHz oscillator. Note that 11 bits can be read, but only 10 bits are used.
LIN Oscillator Calibration
A second calibration mechanism is provided on the ADuC7039
to calibrate the oscillators. This new feature allows for the cali-
bration of the clocks relative to a synchronization element of a
LIN packet. It is based on a fixed and predefined LIN baud rate.
The new trim value is derived from a LIN communication. This
method requires sufficient LIN transactions, approximately 1
for every 10 degrees change in temperature.
If the baud rate measured by the LIN peripheral in the LINBR
MMR is outside the limits defined by user code in LOCMIN
and LOCMAX MMR, the selected oscillator trim bit is modified
accordingly to the options selected in the LIN oscillator
calibration control register, that is, by the number of steps
defined in LOCCON.
Two read-only trim registers indicate the trim currently used
for each of the oscillators. The LIN oscillator calibration block
modifies these two read-only registers and does not modify
the user registers LOCUSRx. When a calibration is complete
the LIN oscillator calibration can be disabled, but before being
disabled, the value of the LOCVALx must be copied into the
corresponding LOCUSRx register. An example is given in the
next section. The status register indicates if the trim register
of the selected oscillator has been altered.
There are 9 MMRs available:
LOCCON Register
Name:
LOCCON
Address:
0xFFFF0480
Default Value:
0x00
Access:
Read/write (key protected)
Function:
Oscillator calibration via LIN control register.
Table 42. LOCCON MMR Bit Designations
Bit
Description
7 to 3
Reserved. Read 0.
2 to 1
Oscillator calibration step size.
0x00 = default value, step of 1.
0x01 = step of 2.
0x10 = step of 3.
0x11 = step of 4.
0
Oscillator calibration via LIN enabled.
This bit is set by the user to enable automatic
calibration of the selected oscillator, based on the LIN
baud rate.
This bit is cleared by the user to disable this automatic
calibration.
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