C167CS datasheet(290/517 Pages) INFINEON

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C167CS

Derivatives

The High-Speed Synchronous Serial Interface

User’s Manual

12-7

V2.0, 2000-07

12.1

Full-Duplex Operation

The different devices are connected through three lines. The definition of these lines is

always determined by the master: The line connected to the master’s data output pin

MTSR is the transmit line, the receive line is connected to its data input line MRST, and

the clock line is connected to pin SCLK. Only the device selected for master operation

generates and outputs the serial clock on pin SCLK. All slaves receive this clock, so their

pin SCLK must be switched to input mode (DP3.13 = ‘0’). The output of the master’s shift

slaves’ shift register input. The output of the slaves’ shift register is connected to the

external receive line in order to enable the master to receive the data shifted out of the

slave. The external connections are hard-wired, the function and direction of these pins

is determined by the master or slave operation of the individual device.

Note: The shift direction shown in Figure 12-4 applies for MSB-first operation as well as

for LSB-first operation.

When initializing the devices in this configuration, select one device for master operation

(SSCMS = ‘1’), all others must be programmed for slave operation (SSCMS = ‘0’).

Initialization includes the operating mode of the device’s SSC and also the function of

the respective port lines (see Chapter 12.4).

Figure 12-4

SSC Full-Duplex Configuration

MCS01963

MRST

SCLK

Device #2

Slave

Clock

Shift Register

MTSR

Clock

Master

Receive

Transmit

Device #1

Clock

MTSR

MRST

SCLK

Shift Register

MTSR

Shift Register

Clock

Slave

SCLK

MRST

Device #3

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