C167CS datasheet(366/517 Pages) INFINEON

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C167CS

Derivatives

The Analog/Digital Converter

User’s Manual

18-9

V2.0, 2000-07

Channel Injection Mode

Channel Injection Mode allows the 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 bitfields CHNR and CHX of register ADDAT2.

Note: Bitfields CHNR and CHX in ADDAT2 are not modified by the A/D converter, but

only the ADRES bit field. Since the channel number for an injected conversion is

not buffered, bitfields CHNR/CHX 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 only change the channel number with

no injected conversion running.

Figure 18-5

Channel Injection Example

# x-2

Write ADDAT2

Int. Request

Conversion

of Channel # y

ADDAT2 Full

Read ADDAT2

Request

Conversion

Write ADDAT;

Injected

Read ADDAT

ADDAT Full

of Channel..

Channel Injection

# x-1

# x+1

# x

# x-1

# x-2

MCA01971

ADEINT

# ...

# x-4

# y

# x-2

# x-3

# x-4

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