T89C51RC2-3CSIM datasheet(69/117 Pages) ATMEL

69 / 117 page

T89C51RB2/RC2

4105D–8051–10/06

Figure 30. SPI Interrupt Requests Generation

Registers

There are three registers in the module that provide control, status and data storage functions. These registers

are describes in the following paragraphs.

Serial Peripheral Control

•

The Serial Peripheral Control Register does the following:

•

Selects one of the Master clock rates,

•

Configure the SPI module as Master or Slave,

•

Selects serial clock polarity and phase,

•

Enables the SPI module,

•

Frees the SS pin for a general purpose

Table 47 describes this register and explains the use of each bit.

Table 47. SPCON Register

SPCON - Serial Peripheral Control Register (0C3H)

SSDIS

MODF

CPU Interrupt Request

SPI Receiver/error

CPU Interrupt Request

SPI Transmitter

SPI

CPU Interrupt Request

SPIF

SPR2

SPEN

SSDIS

MSTR

CPOL

CPHA

SPR1

SPR0

Bit Number

Bit Mnemonic

Description

SPR2

Serial Peripheral Rate 2

Bit with SPR1 and SPR0 define the clock rate.

SPEN

Serial Peripheral Enable

Cleared to disable the SPI interface.

Set to enable the SPI interface.

5SSDIS

SS Disable

Cleared to enable SS# in both Master and Slave modes.

Set to disable SS# in both Master and Slave modes. In Slave mode,

this bit has no effect if CPHA =’0’.

5MSTR

Serial Peripheral Master

Cleared to configure the SPI as a Slave.

Set to configure the SPI as a Master.

4CPOL

Clock Polarity

Cleared to have the SCK set to’0’ in idle state.

Set to have the SCK set to’1’ in idle low.

3CPHA

Clock Phase

Cleared to have the data sampled when the SCK leaves the idle

state (see CPOL).

Set to have the data sampled when the SCK returns to idle state (see

CPOL).

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