ATAR080 datasheet(41/68 Pages) ATMEL

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ATAR080

4675D–4BMCU–12/04

Synchronous Serial Interface

(SSI)

SSI Features

•

2- and 3-wire NRZ

•

2-wire mode

•With Timer 2

–

Bi-phase modulation

–

Manchester modulation

–

Pulse-width demodulation

–

Burst modulation

SSI Peripheral Configuration

The synchronous serial interface (SSI) can be used either for serial communication with

external devices such as EEPROMs, shift registers, display drivers, other microcontrol-

lers, or as a means for generating and capturing on-chip serial streams of data. External

data communication takes place via Port 4’s (BP4) multi-functional port which can be

software configured by writing the appropriate control word into the P4CR register. The

SSI can be configured in any one of the following ways:

2-wire external interface for bi-directional data communication with one data ter-

minal and one shift clock. The SSI uses Port BP43 as a bi-directional serial data

line (SD) and BP40 as a shift clock line (SC).

3-wire external interface for simultaneous input and output of serial data, with a

serial input data terminal (SI), a serial output data terminal (SO) and a shift clock

(SC). The SSI uses BP40 as a shift clock (SC), while the serial data input (SI) is

applied to BP43 (configured in P4CR as input). Serial output data (SO) in this

case is passed through to BP42 (configured in P4CR to T2O) via Timer 2 output

stage (T2M2 configured in mode 6).

Timer/SSI combined modes – the SSI used together with Timer 2 is capable of

performing a variety of data modulation and functions (see section “Timer”). The

modulating data is converted by the SSI into a continuous serial stream of data

which is in turn modulated in one of the timer functional blocks.

Figure 43. Block Diagram of the Synchronous Serial Interface

8-bit Shift Register

MSB

LSB

Shift_CL

SIC1

SIC2

SISC

Control

STB

SRB

Timer 2

Output

INT3

I/O-bus

SSI-Control

TOG2

POUT

T1OUT

SYSCL

Transmit

Buffer

Receive

Buffer

SCI

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