AT89C5132-ROTIL datasheet(120/182 Pages) ATMEL

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4173E–USB–09/07

AT89C5132

19. Synchronous Peripheral Interface

The AT89C5132 implement a Synchronous Peripheral Interface with master and slave modes

capability.

Figure 19-1 shows an SPI bus configuration using the AT89C5132 as master connected to slave

peripherals. Figure 19-2 shows an SPI bus configuration using the AT89C5132 as slave of an

other master.

The bus is made of three wires connecting all the devices together:

•

Master Output Slave Input (MOSI): it is used to transfer data in series from the master to a

slave. It is driven by the master.

•

Master Input Slave Output (MISO): it is used to transfer data in series from a slave to the

master. It is driven by the selected slave.

•

Serial Clock (SCK): it is used to synchronize the data transmission both in and out of the

devices through their MOSI and MISO lines. It is driven by the master for eight clock cycles

which allows to exchange one byte on the serial lines.

Each slave peripheral is selected by one Slave Select pin (SS). If there is only one slave, it may

be continuously selected with SS tied to a low level. Otherwise, the AT89C5132 may select each

device by software through port pins (Pn.x). Special care should be taken not to select two

slaves at the same time to avoid bus conflicts.

Figure 19-1. Typical Master SPI Bus Configuration

Figure 19-2. Typical Slave SPI Bus Configuration

AT89C5132

DataFlash 1

MISO

MOSI

SCK

P4.0

P4.1

P4.2

Pn.z

Pn.y

Pn.x

SCK

DataFlash 2

SCK

LCD

Controller

SCK

MASTER

Slave 1

MISO

MOSI

SCK

SSn

SS1

SS0

SCK

Slave 2

SCK

AT89C5132

Slave n

MISO MOSI SCK

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