MPC823 datasheet(71/74 Pages) MOTOROLA

71 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-449

16.12.4.3 SPI EVENT REGISTER. The 8-bit memory-mapped SPI event (SPIE) register is

used to generate interrupts and report events recognized by the serial peripheral interface.

When an event is recognized, the serial peripheral interface sets the corresponding bit in

this register. Interrupts generated by this register can be masked in the SPIM register. A bit

is cleared by writing a 1 (writing a zero has no effect) and more than one bit can be cleared

at a time. However, all unmasked bits must be cleared before the communication processor

module clears the internal interrupt request. This register is cleared by reset and can be read

at any time.

Bits 0–1 and 4—Reserved

These bits are reserved and must be set to 0.

MME—Multi-Master Error

This bit indicates that the serial peripheral interface has discovered that the SPISEL pin was

asserted externally while the serial peripheral interface was in master mode.

TXE—TX Error

This bit indicates that an error has occurred during transmission.

BSY—Busy Condition

This bit indicates that received data has been discarded due to a lack of buffers. This bit is

set after the first character is received for which there is no receive buffer.

TXB—TX Buffer

This bit indicates that a buffer has been transmitted. It is set once the transmit data of the

last character in the buffer is written to the transmit FIFO. You must wait two character times

to be sure that the data is completely sent over the transmit pin.

RXB—RX Buffer

This bit indicates that a buffer has been received. It set after the last character is written to

the receive buffer and the RX buffer descriptor is closed.

SPIE

BIT

FIELD

RESERVED

MME

TXE

RES

BSY

TXB

RXB

RESET

000000

R/W

ADDR

(IMMR & 0xFFFF0000) + 0xAA6

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