C164CI_02 Datasheet, PDF (343/484 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

C164CI/C164SI
Derivatives
Analog/Digital Converter
Channel Injection Mode
Channel Injection Mode allows conversion of a specific analog channel (also while the
ADC is running in a continuous or auto scan mode) without changing the current
operating mode. After the conversion of this specific channel, the ADC continues with
the original operating mode.
Channel Injection Mode is enabled by setting bit ADCIN in register ADCON and requires
the Wait for ADDAT Read Mode (ADWR = ‘1’). The channel to be converted in this mode
is specified in bitfield CHNR of register ADDAT2.
Note: Bitfield CHNR in ADDAT2 is not modified by the A/D converter, only the ADRES
bit field is modified. Because the channel number for an injected conversion is not
buffered, bit field CHNR of ADDAT2 must never be modified during the sample
phase of an injected conversion; otherwise, the input multiplexer will switch to the
new channel. It is recommended to change the channel number only when no
injected conversion is running.
#x
Conversion
of Channel..
# x-1
# x-2
# x-3
# x-4
# ...
Write ADDAT; # x+1
#x
ADDAT Full
# x-1
# x-2
Read ADDAT
# x+1
#x
# x-1
# x-2
Injected
Conversion
of Channel # y
ADDAT2 Full
Read ADDAT2
Channel Injection
Request
#y
Write ADDAT2
Int. Request
ADEINT
Figure 18-5 Channel Injection Example
# x-3
# x-4
# x-3
# x-4
MCA01971
User’s Manual
18-9
V3.1, 2002-02