MPC823 datasheet(62/74 Pages) MOTOROLA

62 / 74 page

Communication Processor Module

16-440

MPC823 REFERENCE MANUAL

MOTOROLA

16.12.4 Programming the Serial Peripheral Interface

16.12.4.1 SPI MODE REGISTER. The read/write SPI mode (SPMODE) register controls

both the serial peripheral interface operation mode and clock source. Table 16-2 contains

more information on commands that can be used with this register.

Bit 0—Reserved

This bit is reserved and must be set to 0.

LOOP—Loop Mode

When set, this bit selects the local loopback operation. The transmitter output is internally

connected to the receiver input. The receiver and transmitter operate normally, except that

the externally received data is ignored.

0 = Normal operation.

1 = The serial peripheral interface is in loopback mode.

CI—Clock Invert

This bit inverts the SPI clock polarity. See Figure 16-122 and Figure 16-123 for details.

0 = The inactive state of SPICLK is low.

1 = The inactive state of SPICLK is high.

CP—Clock Phase

This bit selects one of two fundamentally different transfer formats. See Figure 16-122 and

Figure 16-123 for details.

0 = SPICLK starts toggling at the middle of the data transfer.

1 = SPICLK starts toggling at the beginning of the data transfer.

DIV16—Divide by 16

This bit selects the clock source for the SPI baud rate generator when configured as an SPI

master. In slave mode, the clock source is the SPICLK pin.

0 = Use the BRGCLK as the input to the SPI baud rate generator.

1 = Use the BRGCLK/16 as the input to the SPI baud rate generator.

SPMODE

BIT

FIELD

RES

LOOP

DIV16

REV

M/S

LEN

RESET

00000000

R/W

ADDR

(IMMR & 0xFFFF0000) + 0xAA0

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