MC9328MX21CJM datasheet(50/100 Pages) FREESCALE

Part #	MC9328MX21CJM

Description	i.MX family of microprocessors

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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MC9328MX21 Technical Data, Rev. 3.3

50

Freescale Semiconductor

Specifications

3.16

Synchronous Serial Interface

The transmit and receive sections of the SSI can be synchronous or asynchronous. In synchronous mode,

the transmitter and the receiver use a common clock and frame synchronization signal. In asynchronous

mode, the transmitter and receiver each have their own clock and frame synchronization signals.

Continuous or gated clock mode can be selected. In continuous mode, the clock runs continuously. In gated

clock mode, the clock functions only during transmission. The internal and external clock timing diagrams

are shown in Figure 42 through Figure 45.

Normal or network mode can also be selected. In normal mode, the SSI functions with one data word of

I/O per frame. In network mode, a frame can contain between 2 and 32 data words. Network mode is

typically used in star or ring-time division multiplex networks with other processors or codecs, allowing

interface to time division multiplexed networks without additional logic. Use of the gated clock is not

allowed in network mode. These distinctions result in the basic operating modes that allow the SSI to

communicate with a wide variety of devices.

The SSI can be connected to 4 set of ports, SAP, SSI1, SSI2 and SSI3.

Figure 42. SSI Transmitter Internal Clock Timing Diagram

CK Output

FS (bl) Output

FS (wl) Output

1

2

6

8

10

11

STXD Output

SRXD Input

32

31

4

12

Note: SRXD input in synchronous mode only.

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