Datasheet

SAM9G20
DS60001516A-page 574  2017 Microchip Technology Inc.
The number of blocks for the read (or write) multiple block operation is not defined. The card will continuously transfer (or program)
data blocks until a stop transmission command is received.
• Multiple block read (or write) with pre-defined block count (since version 3.1 and higher):
The card will transfer (or program) the requested number of data blocks and terminate the transaction. The stop command is not
required at the end of this type of multiple block read (or write), unless terminated with an error. In order to start a multiple block
read (or write) with pre-defined block count, the host must correctly program the MCI Block Register (MCI_BLKR). Otherwise the
card will start an open-ended multiple block read. The BCNT field of the Block Register defines the number of blocks to transfer
(from 1 to 65535 blocks). Programming the value 0 in the BCNT field corresponds to an infinite block transfer.
34.7.3 Read Operation
The following flowchart shows how to read a single block with or without use of PDC facilities. In this example (see Figure 34-10), a polling
method is used to wait for the end of read. Similarly, the user can configure the interrupt enable register (MCI_IER) to trigger an interrupt
at the end of read.