AT89C5132-ROTIL datasheet(129/182 Pages) ATMEL

129 / 182 page

129

4173E–USB–09/07

AT89C5132

Figure 19-12. Slave SPI Interrupt Policy Flows

19.4

Registers

Table 98. SPCON Register

SPCON (S:C3h) – SPI Control Register

SPI Initialization

Interrupt Policy

Enable Interrupt

ESPI =1

SPI Interrupt

Service Routine

Select Slave Mode

MSTR = 0

Select Format

Program CPOL & CPHA

Enable SPI

SPEN = 1

Get Status

Read SPSTA

Prepare New Transfer

Write Data in SPDAT

Get Data Received

Read SPDAT

Prepare Transfer

Write Data in SPDAT

SPR2

SPEN

SSDIS

MSTR

CPOL

CPHA

SPR1

SPR0

Bit Number

Bit

Mnemonic

Description

SPR2

SPI Rate Bit 2

Refer to Table 97 for bit rate description.

SPEN

SPI Enable Bit

Set to enable the SPI interface.

Clear to disable the SPI interface.

SSDIS

Slave Select Input Disable Bit

Set to disable SS in both master and slave modes. In slave mode this bit has no effect if

CPHA = 0.

Clear to enable SS in both master and slave modes.

MSTR

Master Mode Select

Set to select the master mode.

Clear to select the slave mode.

CPOL

SPI Clock Polarity Bit(1)

Set to have the clock output set to high level in idle state.

Clear to have the clock output set to low level in idle state.

CPHA

SPI Clock Phase Bit

Set to have the data sampled when the clock returns to idle state (see CPOL).

Clear to have the data sampled when the clock leaves the idle state (see CPOL).

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