ST10 datasheet(24/65 Pages) STMICROELECTRONICS

24 / 65 page

ST10C167

24/65

XIII - SERIAL CHANNELS

Serial communication with other microcontrollers,

processors, terminals or external peripheral com-

ponents is provided by two serial interfaces: the

asynchronous/synchronous

serial

channel

(ASC0) and the high-speed synchronous serial

channel (SSC).

Two dedicated Baud rate generators set up all

standard Baud rates without the requirement of

oscillator tuning.

For transmission, reception and erroneous recep-

tion, 3 separate interrupt vectors are provided for

each serial channel.

ASCO

supports

full-duplex

asynchronous

communication

781.25K

Baud

and

half-duplex synchronous communication up to

5M Baud

25MHz

system

clock.

For

asynchronous operation, the Baud rate generator

provides a clock with 16 times the rate of the

established Baud rate.

The table below lists various commonly used

Baud rates together with the required reload val-

ues and the deviation errors compared to the

intended Baud rate (see Table 10).

For synchronous operation, the Baud rate genera-

tor provides a clock with 4 times the rate of the

established Baud rate.

Note

The deviation errors given in the table above are rounded. Using a Baud rate crystal will provide correct Baud rates without deviation

errors.

Table 10 : Commonly used Baud rates by reload value and deviation errors

S0BRS = ‘0’, fCPU = 25MHz

S0BRS = ‘1’, fCPU = 25MHz

Baud Rate (Baud)

Deviation Error

Reload Value

Baud Rate (Baud)

Deviation Error

Reload Value

781250

±0.0%

0000H

520833

±0.0%

0000H

56000

+7.3% / -0.4%

000CH / 000DH

56000

+3.3% / -7.0%

0008H / 0009H

38400

+1.7% / -3.1%

0013H / 0014H

38400

+4.3% / -3.1%

000CH / 000DH

19200

+1.7% / -0.8%

0027H / 0028H

19200

+0.5% / -3.1%

001AH / 001BH

9600

+0.5% / -0.8%

0050H/ 0051H

9600

+0.5% / -1.4%

0035H / 0036H

4800

+0.5% / -0.1%

00A1H / 00A2H

4800

+0.5% / -0.5%

006BH / 006CH

2400

+0.2% / -0.1%

0144H / 0145H

2400

+0.0% / -0.5%

00D8H / 00D9H

1200

+0.0% / -0.1%

028AH / 028BH

1200

+0.0% / -0.2%

01B1H / 01B2H

600

+0.0% / -0.1%

0515H / 0516H

600

+0.0% / -0.1%

0363H / 0364H

+0.4% / 0.4%

1FFFH / 1FFFH

+0.0% / 0.0%

1B1FH / 1B20H

+0.9% / 0.9%

1FFFH / 1FFFH

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