ST10F268 datasheet(35/74 Pages) STMICROELECTRONICS

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ST10F168

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High Speed Synchronous Serial Channel (SSC)

The High-Speed Synchronous Serial Interface

SSC provides flexible high-speed serial communi-

cation between the ST10F168 and other microcon-

trollers, microprocessors or external peripherals.

The SSC supports full-duplex and half-duplex syn-

chronous communication; The serial clock signal

can be generated by the SSC 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 Baud rate generator pro-

vides the SSC with a separate serial clock signal.

The serial channel SSC has its own dedicated

16-bit Baud rate generator with 16-bit reload

capability, allowing Baud rate generation indepen-

dent from the timers.

SSCBR is the dual-function Baud rate Generator /

Reload register. Table 19 lists some possible

Baud rates against the required reload values and

the resulting bit times for a 25MHz CPU clock.

Note: The deviation errors given in the Table 18

are rounded. To avoid deviation errors use

a Baud rate crystal (providing a multiple of

the ASC0/SSC sampling frequency).

Table 19 : Synchronous Baud rate and reload

values

Baud Rate

Bit Time

Reload Value

Reserved use a

reload value > 0.

---

0000h

5M Baud

200ns

0001h

3.3M Baud

303ns

0002h

2.5M Baud

400ns

0004h

2M Baud

500ns

0005h

1M Baud

µs

000Bh

100K Baud

µs

007Ch

10K Baud

100

µs

04E1h

1K Baud

1ms

30D3h

190.7 Baud

5.2ms

FFFFh

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