參數(shù)資料
型號(hào): MC68HC908QL4CP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDIP16
封裝: PLASTIC DIP-16
文件頁(yè)數(shù): 94/244頁(yè)
文件大小: 3228K
代理商: MC68HC908QL4CP
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Slave LIN Interface Controller (SLIC)
Oscillator Trimming with SLIC
MC68HC908QL Family
Data Sheet
MOTOROLA
Slave LIN Interface Controller (SLIC)
183
14.19 Oscillator Trimming with SLIC
The SLCACT bit can be used as an indicator of LIN bus activity. SLCACT tells the
user that the SLIC is currently processing a message header (therefore
synchronizing to the bus) or processing a message frame (including checksum).
Therefore, at idle times between message frames or during a message frame
which has been marked as a "don’t care" by writing the IMSG bit, it is possible to
trim the oscillator circuit of the MCU with no impact to the LIN communications.
It is important to note the exact mechanisms with which the SLIC sets and clears
the SLCACT bit. Any falling edge which successfully passes through the digital
receive filter will cause the SLCACT bit to become set. This might even include
noise pulses, if they are of sufficient length to pass through the digital RX filter.
Although in these cases the SLCACT bit is becoming set on a noise spike, it is very
probable that noise of this nature will cause other system issues as well such as
corruption of the message frame. The software can then further qualify if it is
appropriate to trim the oscillator.
The SLCACT bit will only be cleared by the SLIC upon successful completion of a
normal LIN message frame (see 14.6.3 SLIC Status Register description for more
detail). This means that in some cases, if a message frame terminates with an error
condition or some source other than those cited in the SLCACT bit description, the
SLCACT might remain set during an otherwise idle bus time. The SLCACT will then
clear upon the successful completion of the next LIN message frame.
These mechanisms might result in SLCACT being set when it is safe (from the
SLIC module perspective) to trim the oscillator. However, the SLCACT bit will only
be clear when the SLIC considers it safe to trim the oscillator.
Table 14-9. Recommended Maximum Bit Rates
for BTM Operation Due to Digital Filter
SLIC
Clock
(MHz)
Maximum BTM
Bit Rate with
Digital RX Filter Set
to
÷4
(Bits / Second)
Maximum BTM
Bit Rate with
Digital RX Filter Set
to
÷3
(Bits / Second)
Maximum BTM
Bit Rate with
Digital RX Filter Set
to
÷2
(Bits / Second)
Maximum BTM
Bit Rate with
Digital RX Filter Set
to
÷1
(Bits / Second)
8
62,500
83,333
125,000
250,000
6.4
50,000
66,667
100,000
200,000
4.8
37,500
50,000
75,000
150,000
4
31,250
41,667
62,500
125,000
3.2
25,000
33,333
50,000
100,000
2.4
18,750
25,000
37,500
125,000
2
15,625
20,833
31,250
62,500
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