XC164-16 Datasheet, PDF (91/417 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller with C166SV2 Core Volume 2 (of 2): Peripheral Units

XC164-16 Derivatives
Peripheral Units (Vol. 2 of 2)
The Analog/Digital Converter
• In Auto Scan Single Conversion mode, the ADC continues the auto scan round until
the conversion of channel 0 is finished, then it stops. There is no difference to the
operation if ADST was not cleared by software.
• In Auto Scan Continuous Conversion mode, the ADC continues the auto scan round
until the conversion of channel 0 is finished, then it stops. This is the usual way to
terminate this conversion mode.
A restart of the ADC can be performed by clearing and then setting bit ADST. This
sequence will abort the current conversion and restart the ADC with the new parameters
given in the control registers.
Conversion Mode Selection, ADM
Bitfield ADM selects the conversion mode of the A/D converter, as listed in Table 16-1.
Table 16-1
ADM
00
01
10
11
A/D Converter Conversion Mode
Description
Fixed Channel Single Conversion
Fixed Channel Continuous Conversion
Auto Scan Single Conversion
Auto Scan Continuous Conversion
While a conversion is in progress, the mode selection field ADM and the channel
selection field ADCH may be changed. ADM will be evaluated after the current
conversion. ADCH will be evaluated after the current conversion (fixed channel modes)
or after the current conversion sequence (auto scan modes).
Conversion Resolution Control, RES
The ADC can produce either a 10-bit result (RES = 0) or an 8-bit result (RES = 1).
Depending on the application’s needs a higher conversion speed (an 8-bit conversion
requires less conversion time) or a higher resolution can be chosen.
User’s Manual
ADC_X41, V2.1
16-9
V2.1, 2004-03