Route VREFH
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MC908JL16CSPE
寤犲晢锛� Freescale Semiconductor
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鐢�(ch菐n)鍝佺洰閷勯爜(y猫)闈細 724 (CN2011-ZH PDF)
閰嶇敤锛� DEMO908JL16E-ND - BOARD DEMO FOR MC908JL16
绗�1闋�(y猫)绗�2闋�(y猫)绗�3闋�(y猫)绗�4闋�(y猫)绗�5闋�(y猫)绗�6闋�(y猫)绗�7闋�(y猫)绗�8闋�(y猫)绗�9闋�(y猫)绗�10闋�(y猫)绗�11闋�(y猫)绗�12闋�(y猫)绗�13闋�(y猫)绗�14闋�(y猫)绗�15闋�(y猫)绗�16闋�(y猫)绗�17闋�(y猫)绗�18闋�(y猫)绗�19闋�(y猫)绗�20闋�(y猫)绗�21闋�(y猫)绗�22闋�(y猫)绗�23闋�(y猫)绗�24闋�(y猫)绗�25闋�(y猫)绗�26闋�(y猫)绗�27闋�(y猫)绗�28闋�(y猫)绗�29闋�(y猫)绗�30闋�(y猫)绗�31闋�(y猫)绗�32闋�(y猫)绗�33闋�(y猫)绗�34闋�(y猫)绗�35闋�(y猫)绗�36闋�(y猫)鐣�(d膩ng)鍓嶇37闋�(y猫)绗�38闋�(y猫)绗�39闋�(y猫)绗�40闋�(y猫)绗�41闋�(y猫)绗�42闋�(y猫)绗�43闋�(y猫)绗�44闋�(y猫)绗�45闋�(y猫)绗�46闋�(y猫)绗�47闋�(y猫)绗�48闋�(y猫)绗�49闋�(y猫)绗�50闋�(y猫)绗�51闋�(y猫)绗�52闋�(y猫)绗�53闋�(y猫)绗�54闋�(y猫)绗�55闋�(y猫)绗�56闋�(y猫)绗�57闋�(y猫)绗�58闋�(y猫)绗�59闋�(y猫)绗�60闋�(y猫)绗�61闋�(y猫)绗�62闋�(y猫)绗�63闋�(y猫)绗�64闋�(y猫)绗�65闋�(y猫)绗�66闋�(y猫)绗�67闋�(y猫)绗�68闋�(y猫)绗�69闋�(y猫)绗�70闋�(y猫)绗�71闋�(y猫)绗�72闋�(y猫)绗�73闋�(y猫)绗�74闋�(y猫)绗�75闋�(y猫)绗�76闋�(y猫)绗�77闋�(y猫)绗�78闋�(y猫)绗�79闋�(y猫)绗�80闋�(y猫)绗�81闋�(y猫)绗�82闋�(y猫)绗�83闋�(y猫)绗�84闋�(y猫)绗�85闋�(y猫)绗�86闋�(y猫)绗�87闋�(y猫)绗�88闋�(y猫)绗�89闋�(y猫)绗�90闋�(y猫)绗�91闋�(y猫)绗�92闋�(y猫)绗�93闋�(y猫)绗�94闋�(y猫)绗�95闋�(y猫)绗�96闋�(y猫)绗�97闋�(y猫)绗�98闋�(y猫)绗�99闋�(y猫)绗�100闋�(y猫)绗�101闋�(y猫)绗�102闋�(y猫)绗�103闋�(y猫)绗�104闋�(y猫)绗�105闋�(y猫)绗�106闋�(y猫)绗�107闋�(y猫)绗�108闋�(y猫)绗�109闋�(y猫)绗�110闋�(y猫)绗�111闋�(y猫)绗�112闋�(y猫)绗�113闋�(y猫)绗�114闋�(y猫)绗�115闋�(y猫)绗�116闋�(y猫)绗�117闋�(y猫)绗�118闋�(y猫)绗�119闋�(y猫)绗�120闋�(y猫)绗�121闋�(y猫)绗�122闋�(y猫)绗�123闋�(y猫)绗�124闋�(y猫)绗�125闋�(y猫)绗�126闋�(y猫)绗�127闋�(y猫)绗�128闋�(y猫)绗�129闋�(y猫)绗�130闋�(y猫)绗�131闋�(y猫)绗�132闋�(y猫)绗�133闋�(y猫)绗�134闋�(y猫)绗�135闋�(y猫)绗�136闋�(y猫)绗�137闋�(y猫)绗�138闋�(y猫)绗�139闋�(y猫)绗�140闋�(y猫)绗�141闋�(y猫)绗�142闋�(y猫)绗�143闋�(y猫)绗�144闋�(y猫)绗�145闋�(y猫)绗�146闋�(y猫)绗�147闋�(y猫)绗�148闋�(y猫)绗�149闋�(y猫)绗�150闋�(y猫)绗�151闋�(y猫)绗�152闋�(y猫)绗�153闋�(y猫)绗�154闋�(y猫)绗�155闋�(y猫)绗�156闋�(y猫)绗�157闋�(y猫)绗�158闋�(y猫)绗�159闋�(y猫)绗�160闋�(y猫)绗�161闋�(y猫)绗�162闋�(y猫)绗�163闋�(y猫)绗�164闋�(y猫)绗�165闋�(y猫)绗�166闋�(y猫)绗�167闋�(y猫)绗�168闋�(y猫)绗�169闋�(y猫)绗�170闋�(y猫)绗�171闋�(y猫)绗�172闋�(y猫)绗�173闋�(y猫)绗�174闋�(y猫)绗�175闋�(y猫)绗�176闋�(y猫)绗�177闋�(y猫)绗�178闋�(y猫)绗�179闋�(y猫)绗�180闋�(y猫)绗�181闋�(y猫)绗�182闋�(y猫)绗�183闋�(y猫)绗�184闋�(y猫)绗�185闋�(y猫)绗�186闋�(y猫)绗�187闋�(y猫)绗�188闋�(y猫)绗�189闋�(y猫)绗�190闋�(y猫)绗�191闋�(y猫)绗�192闋�(y猫)绗�193闋�(y猫)绗�194闋�(y猫)绗�195闋�(y猫)绗�196闋�(y猫)绗�197闋�(y猫)绗�198闋�(y猫)绗�199闋�(y猫)绗�200闋�(y猫)绗�201闋�(y猫)绗�202闋�(y猫)绗�203闋�(y猫)绗�204闋�(y猫)绗�205闋�(y猫)绗�206闋�(y猫)绗�207闋�(y猫)绗�208闋�(y猫)绗�209闋�(y猫)绗�210闋�(y猫)绗�211闋�(y猫)绗�212闋�(y猫)绗�213闋�(y猫)绗�214闋�(y猫)绗�215闋�(y猫)绗�216闋�(y猫)绗�217闋�(y猫)绗�218闋�(y猫)绗�219闋�(y猫)绗�220闋�(y猫)绗�221闋�(y猫)绗�222闋�(y猫)绗�223闋�(y猫)绗�224闋�(y猫)绗�225闋�(y猫)绗�226闋�(y猫)绗�227闋�(y猫)绗�228闋�(y猫)绗�229闋�(y猫)绗�230闋�(y猫)
Registers
MC68HC908JL16 Data Sheet, Rev. 1.1
Freescale Semiconductor
131
NOTE
Route VREFH carefully for maximum noise immunity and place bypass
capacitors as near as possible to the package.
AC current in the form of current spikes required to supply charge to the capacitor array at each
successive approximation step is drawn through the VREFH and VREFL loop. The best external component
to meet this current demand is a 0.1
F capacitor with good high frequency characteristics. This capacitor
is connected between VREFH and VREFL and must be placed as close as possible to the package pins.
Resistance in the path is not recommended because the current will cause a voltage drop which could
result in conversion errors. Inductance in this path must be minimum (parasitic only).
9.7.4 ADC10 Voltage Reference Low Pin (VREFL)
VREFL is the power supply for setting the low-reference voltage for the converter. In some packages,
VREFL is connected internally to VSSA. If externally available, connect the VREFL pin to the same voltage
potential as VSSA. There will be a brief current associated with VREFL when the sampling capacitor is
charging. If externally available, connect the VREFL pin to the same potential as VSSA at the single point
ground location.
9.7.5 ADC10 Channel Pins (ADn)
The ADC10 has multiple input channels. Empirical data shows that capacitors on the analog inputs
improve performance in the presence of noise or when the source impedance is high. 0.01
F capacitors
with good high-frequency characteristics are sufficient. These capacitors are not necessary in all cases,
but when used they must be placed as close as possible to the package pins and be referenced to VSSA.
9.8 Registers
These registers control and monitor operation of the ADC10:
ADC10 status and control register, ADCSC
ADC10 data registers, ADRH and ADRL
ADC10 clock register, ADCLK
9.8.1 ADC10 Status and Control Register
This section describes the function of the ADC10 status and control register (ADCSC). Writing ADCSC
aborts the current conversion and initiates a new conversion (if the ADCH[4:0] bits are equal to a value
other than all 1s).
Address:
$003C
Bit 7
654321
Bit 0
Read:
COCO
AIEN
ADCO
ADCH4
ADCH3
ADCH2
ADCH1
ADCH0
Write:
Reset:
00011111
= Unimplemented
Figure 9-3. ADC10 Status and Control Register (ADCSC)
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
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