ST10F268 datasheet(34/74 Pages) STMICROELECTRONICS

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ST10F168

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14 - 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 reception, 3 separate interrupt vectors

are provided for each serial channel.

ASC0

ASC0 supports full-duplex asynchronous commu-

nication at up to 781.25K Baud and half-duplex

synchronous communication up to 5M Baud at

25MHz system clock.

For asynchronous operation, the Baud rate gener-

ator provides a clock with 16 times the rate of the

established Baud rate.

Table 18 lists various commonly used Baud rates

together with the required reload values and the

deviation

errors

compared

the

intended

Baud rate.

For synchronous operation, the Baud rate genera-

tor provides a clock with 4 times the rate of the

established Baud rate.

Table 18 : 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

781 250

±0.0%

0000h

520 833

±0.0%

0000h

56 000

+7.3% / -0.4%

000Ch / 000Dh

56 000

+3.3% / -7.0%

0008h / 0009h

38 400

+1.7% / -3.1%

0013h / 0014h

38 400

+4.3% / -3.1%

000Ch / 000Dh

19 200

+1.7% / -0.8%

0027h / 0028h

19 200

+0.5% / -3.1%

001Ah / 001Bh

9 600

+0.5% / -0.8%

0050h/ 0051h

9 600

+0.5% / -1.4%

0035h / 0036h

4 800

+0.5% / -0.1%

00A1h / 00A2h

4 800

+0.5% / -0.5%

006Bh / 006Ch

2 400

+0.2% / -0.1%

0144h / 0145h

2 400

+0.0% / -0.5%

00D8h / 00D9h

1 200

+0.0% / -0.1%

028Ah / 028Bh

1 200

+0.0% / -0.2%

01B1h / 01B2h

600

+0.0% / -0.1%

0515h / 0516h

600

+0.0% / -0.1%

0363h / 0364h

+0.4%

1FFFh / 1FFFh

+0.0% / -0.0%

1B1Fh / 1B20h

+0.9%

1FFFh / 1FFFh

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