EM6812F2TP24B datasheet(47/81 Pages) EMMICRO

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EM6812

www.emmicroelectronic.com

12 Serial Port Interface

12.1

Basic features:

The SPI is a 3-wire serial interface, its inputs and outputs are mapped on the port B in following manner:

SIN:

Serial Input Data

PB[7]

SOUT: Serial Output Data

PB[6]

SCLK: Serial Clock

PB[5]

•

Master or Slave byte-wise serial communication.

Master mode: 6 internal clock sources (prescaler frequencies or from selected timer1 periods) and 1 external clock

input on PA[5].

Slave Mode : External clock source from port B, PB[5]

•

Transmission order, MSB or LSB first selection.

•

The active edge of the serial interface is selectable (positive or negative edge)

•

Data output synchronization with the opposite shift clock.

•

Auto-Start mode; which allows to have a fix data stream output (UART support)

•

Two maskable interruptions are generated.

Beginning of the transmission

End of the transmission.

12.1.1 Overview:

Figure 25 : SPI architecture

Shift Register &

State Count

Shift_Clk

Load register

Synchro

Master clock1

Master clock2

Master clock3

Master clock4

Master clock5

Master clock7

Master clock6

EnSPI

MS[2:0]

ENB

ENA

SEL

PosnNegShft

Start

PB[7]

:SIN

MSBnLSB

RegSPILoad[7:0]

PB[6]

:SOUT

PB[5]

:SCLK

IrqSPI[1:0]

RegSPI[7:0]

EM6812F2TP24B 数据表(PDF) 47 Page - EM Microelectronic - MARIN SA

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