ST10F272M_12 datasheet(68/176 Pages) STMICROELECTRONICS

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Serial channels

ST10F272M

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Doc ID 12968 Rev 3

Serial channels

Serial communication with other microcontrollers, microprocessors, terminals or external peripheral

components is provided by up to four serial interfaces: Two asynchronous/

synchronous serial channels (ASC0 and ASC1) and two high-speed synchronous serial channel (SSC0

and SSC1). Dedicated baudrate generators set up all standard baudrates without the requirement of

oscillator tuning. For transmission, reception and erroneous reception, separate interrupt vectors are

provided for ASC0 and SSC0 serial channel. A more complex mechanism of interrupt sources

multiplexing is implemented for ASC1 and SSC1 (XBUS mapped).

15.1

Asynchronous/synchronous serial interfaces

The asynchronous / synchronous serial interfaces (ASC0 and ASC1) provides serial communication

between the ST10F272M and other microcontrollers, microprocessors or external peripherals.

15.2

ASCx in asynchronous mode

In asynchronous mode, 8- or 9-bit data transfer, parity generation and the number of stop bits can be

selected. Parity framing and overrun error detection is provided to increase the reliability of data

transfers. Transmission and reception of data is double-buffered. Full-duplex communication up to

1.25 Mbaud (at 40 MHz of fCPU) is supported in this mode.

Note:

The deviation errors given in Table 37 are rounded off. To avoid deviation errors use a

baudrate crystal (providing a multiple of the ASC0 sampling frequency).

Table 37.

ASC asynchronous baudrates by reload value and deviation errors (fCPU = 40 MHz)

S0BRS = ‘0’, fCPU = 40 MHz

S0BRS = ‘1’, fCPU = 40 MHz

Baudrate (baud)

Deviation

error

Reload value (hex) Baudrate (baud) Deviation error Reload value (hex)

1 250 000

0.0%/0.0%

0000/0000

833 333

0.0%/0.0%

0000/0000

112 000

+1.5%/-7.0%

000A/000B

112 000

+6.3%/-7.0%

0006/0007

56 000

+1.5%/-3.0%

0015/0016

56 000

+6.3%/-0.8%

000D/000E

38 400

+1.7%/-1.4%

001F/0020

38 400

+3.3%/-1.4%

0014/0015

19 200

+0.2%/-1.4%

0040/0041

19 200

+0.9%/-1.4%

002A/002B

9 600

+0.2%/-0.6%

0081/0082

9 600

+0.9%/-0.2%

0055/0056

4 800

+0.2%/-0.2%

0103/0104

4 800

+0.4%/-0.2%

00AC/00AD

2 400

+0.2%/0.0%

0207/0208

2 400

+0.1%/-0.2%

015A/015B

1 200

0.1%/0.0%

0410/0411

1 200

+0.1%/-0.1%

02B5/02B6

600

0.0%/0.0%

0822/0823

600

+0.1%/0.0%

056B/056C

300

0.0%/0.0%

1045/1046

300

0.0%/0.0%

0AD8/0AD9

153

0.0%/0.0%

1FE8/1FE9

102

0.0%/0.0%

1FE8/1FE9

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