Analog Devices SHARC ADSP-2136 Series Hardware Reference Manual page 260

Table of Contents

Programming Model

If the transmit buffer remains empty, or the receive buffer remains full,

the devices operate according to the states of the

transmits zero's on the

mits the last word transmitted before the transmit buffer became

= 1 and the receive buffer is full, the device continues to

receive new data from the

= 0 and the receive buffer is full, the incoming data is dis-

carded, and the

Master Mode DMA Transfers

To configure the SPI port for master mode DMA transfers:

1. Specify which

one or more of the

2. Enable the device as a master and configure the SPI system by

selecting the appropriate word length, transfer format, baud rate,

and so on in the

(bits 1–0) in the

or receive with DMA mode (

3. Activate the desired slaves by clearing one or more of the SPI flag

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= 1 and the transmit buffer is empty, the device repeatedly

= 0 and the transmit buffer is empty, it repeatedly trans-

registers are not updated.

pins to use as the slave-select signals by setting

bits (bits 3–0) in the SPI flag (

registers is configured to select transmit

ADSP-2136x SHARC Processor Hardware Reference

for the ADSP-21362/3/4/5/6 Processors

pin, overwriting the older data in

registers. The

registers, if