ST10F272M datasheet(69/175 Pages) STMICROELECTRONICS

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ST10F272M

Serial channels

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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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