P83C266BDR datasheet(45/92 Pages) PHILIPS

45 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

16.1

ADC Control Register 1 (SAD)

Table 44 ADC Control Register 1 (SFR address C8H)

Table 45 Description of SAD bits

Table 46 ADC input channel selection

16.2

ADC Control Register 2 (SAD2)

Table 47 ADC Control Register 2 (SFR address CAH)

Table 48 Description of SAD2 bits

76543210

VHI

CH1

CH0

SAD3

SAD2

SAD1

SAD0

BIT

SYMBOL

DESCRIPTION

VHI

Compare result. If VHI = 0, then the ADC input voltage is lower than the reference

voltage. If VHI = 1, then the ADC input voltage is higher than the reference voltage.

CH1

ADC input channel selection. These 2 bits select the ADC channel, see Table 46.

CH0

4ST

Start voltage comparison. If ST = 0, voltage comparison is disabled. If ST = 1, a

voltage comparison is started.

SAD3

Reference voltage level selection. These 4 bits are used to select the analog output

voltage (Vref) of the 4-bit DAC. Vref is calculated as shown below.

SAD2

SAD1

SAD0

CH1

CH0

CHANNEL SELECTED

Reserved.

Input channel ADC0 selected.

Input channel ADC1 selected.

Input channel ADC2 selected.

76543210

−−−−−

ADCE2

ADCE1

ADCE0

BIT

SYMBOL

DESCRIPTION

7to3

−

These 5 bits are not used.

ADCE2

ADC2 input select. If ADC2 = 1, then pin 11 is selected as the ADC2 input. If

ADC2 = 0, then pin 11 is selected as the open-drain bidirectional port line P3.2.

ADCE1

ADC1 input select. If ADC1 = 1, then pin 10 is selected as the ADC1 input. If

ADC2 = 0, then pin 10 is selected as the open-drain bidirectional port line P3.1.

ADCE0

ADC0 input select. If ADC0 = 1, then pin 9 is selected as the ADC0 input. If ADC0 = 0,

then pin 9 is selected as the open-drain bidirectional port line P3.0.

ref

----------

SAD value

()

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