
Chapter 1 Device Overview MC9S12XE-Family
MC9S12XE-Family Reference Manual , Rev. 1.21
86
Freescale Semiconductor
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1.7
ADC0 Conguration
1.7.1
External Trigger Input Connection
The ADC module includes four external trigger inputs ETRIG0, ETRIG1, ETRIG2, and ETRIG3. The
external trigger allows the user to synchronize ADC conversion to external trigger events.
Table 1-17shows the connection of the external trigger inputs.
Consult the ATD block description for information about the analog-to-digital converter module. ATD
block description refererences to freeze mode are equivalent to active BDM mode.
1.7.2
ADC0 Channel[17] Connection
Further to the 16 externally available channels, ADC0 features an extra channel[17] that is connected to
the internal temperature sensor at device level. To access this channel ADC0 must use the channel
encoding SC:CD:CC:CB:CA = 1:0:0:0:1 in ATDCTL5. For more temperature sensor information, please
1.8
ADC1 External Trigger Input Connection
The ADC module includes four external trigger inputs ETRIG0, ETRIG1, ETRIG2, and ETRIG3. The
external trigger feature allows the user to synchronize ADC conversion to external trigger events.
Table 1-18 shows the connection of the external trigger inputs.
Consult the ADC block description for information about the analog-to-digital converter module. ADC
block description refererences to freeze mode are equivalent to active BDM mode.
Table 1-17. ATD0 External Trigger Sources
External Trigger
Input
Connectivity
ETRIG0
Pulse width modulator channel 1
ETRIG1
Pulse width modulator channel 3
ETRIG2
Periodic interrupt timer hardware trigger 0
ETRIG3
Periodic interrupt timer hardware trigger 1
Table 1-18. ATD1 External Trigger Sources
External Trigger
Input
Connectivity
ETRIG0
Pulse width modulator channel 1
ETRIG1
Pulse width modulator channel 3
ETRIG2
Periodic interrupt timer hardware trigger 0
ETRIG3
Periodic interrupt timer hardware trigger 1