ST10F272M_12 datasheet(69/176 Pages) STMICROELECTRONICS

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ST10F272M

Serial channels

Doc ID 12968 Rev 3

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15.3

ASCx in synchronous mode

In synchronous mode, data is transmitted or received synchronously to a shift clock which is generated

by the ST10F272M. Half-duplex communication up to 5 Mbaud (at 40 MHz of fCPU) is possible in this

mode.

Note:

The deviation errors given in the Table 38 are rounded off. To avoid deviation errors use a

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

15.4

High speed synchronous serial interfaces

The high-speed synchronous serial interfaces (SSC0 and SSC1) provides flexible high-speed serial

communication between the ST10F272M and other microcontrollers, microprocessors or external

peripherals.

The SSCx supports full-duplex and half-duplex synchronous communication. The serial clock signal can

be generated by the SSCx itself (master mode) or be received from an external master (slave mode).

Data width, shift direction, clock polarity and phase are programmable.

This allows communication with SPI-compatible devices. Transmission and reception of data is double-

buffered. A 16-bit baudrate generator provides the SSCx with a separate serial clock signal. The serial

channel SSCx has its own dedicated 16-bit baudrate generator with 16-bit reload capability, allowing

baudrate generation independent from the timers.

Table 39 lists some possible baudrates against the required reload values and the resulting bit times for

the 40 MHz CPU clock. The maximum is limited to 8 Mbaud.

Table 38.

ASC synchronous 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)

5 000 000

0.0%/0.0%

0000/0000

3 333 333

0.0%/0.0%

0000/0000

112 000

+1.5%/-0.8%

002B/002C

112 000

+2.6%/-0.8%

001C/001D

56 000

+0.3%/-0.8%

0058/0059

56 000

+0.9%/-0.8%

003A/003B

38 400

+0.2%/-0.6%

0081/0082

38 400

+0.9%/-0.2%

0055/0056

19 200

+0.2%/-0.2%

0103/0104

19 200

+0.4%/-0.2%

00AC/00AD

9 600

+0.2%/0.0%

0207/0208

9 600

+0.1%/-0.2%

015A/015B

4 800

+0.1%/0.0%

0410/0411

4 800

+0.1%/-0.1%

02B5/02B6

2 400

0.0%/0.0%

0822/0823

2 400

+0.1%/0.0%

056B/056C

1 200

0.0%/0.0%

1045/1046

1 200

0.0%/0.0%

0AD8/0AD9

900

0.0%/0.0%

15B2/15B3

600

0.0%/0.0%

15B2/15B3

612

0.0%/0.0%

1FE8/1FE9

407

0.0%/0.0%

1FFD/1FFE

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