ST92F124 datasheet(372/429 Pages) STMICROELECTRONICS

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10-BIT ANALOG TO DIGITAL CONVERTER (ADC)

CONTROL LOGIC REGISTER 1 (CLR1)

R252 - Read/Write

Reset Value: 0000 1111 (0Fh)

Bits 7:4 = SC[3:0]: Start Conversion Channel

These four bits define the starting analog input

channel (Autoscan Mode). The first channel ad-

dressed by SC[3:0] is converted, then the channel

number is incremented for the successive conver-

sion, until channel 15 (1111) is converted. When

SC3, SC2, SC1 and SC0 are all set, only channel

15 will be converted.

Bits 3:0 = CC[3:0]: Compare Channels

The programmed value corresponds to the first of

the two adjacent channels (A) on which it is possi-

ble to define a level window for the converted ana-

log input (see Table 68).

Note: If a write access to this register occurs, the

conversion is re-started from the SC[3:0] channel.

CONTROL LOGIC REGISTER 2 (CLR2)

R253 - Read/Write

Reset Value: 1010 0000 (A0h)

Bits 7:5 = PR[2:0]: INTCLK Frequency Prescaler

These bits determine the ratio between the ADC

clock and the system clock (INTCLK) according to

Table 69.

SC3

SC2

SC1

SC0

CC3

CC2

CC1

CC0

Table 68. Compare Channels definition

CC[3:0]

Channel A

Channel B

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

PR2

PR1

PR0 EXTG INTG POW CONT

Table 68. Compare Channels definition

CC[3:0]

Channel A

Channel B

Table 69. Prescaler programming

PR[2:0]

TA/D clock/

TINTCLK

fADC

(MHz)

TSample

(µs)

TConv

(µs)

fADC

(MHz)

TSample

(µs)

TConv

(µs)

fADC

(MHz)

TSample

(µs)

TConv

(µs)

@TINTCLK= 8MHz

@TINTCLK= 20MHz

@TINTCLK=24MHz

000

4.00

10.00

Not Allowed

12.00

Not Allowed

001

2.00

5.00

Not Allowed

6.00

Not Allowed

010

1.33

3.33

2.4

8.4

4.00

011

1.00

2.50

3.2

11.2

3.00

2.66

9.33

100

0.80

Not Allowed

2.00

2.40

3.33

11.66

101

0.66

Not Allowed

1.66

4.8

16.8

2.00

110

0.57

Not Allowed

1.43

5.6

19.6

1.71

4.66

16.33

111

0.50

Not Allowed

1.25

6.4

22.4

1.50

5.33

18.66

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