Datasheet

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SIZE[2:0] Description

0x4 128 Byte

(1)

0x5 256 Byte

(1)

0x6 512 Byte

(1)

0x7 1024 Byte in HS mode

(1)

1023 Byte in FS mode

(1)

1. For Isochronous pipe only.

Bits 27:14 – MULTI_PACKET_SIZE[13:0] Multi Packet IN or OUT size

These bits define the 14-bit value that is used for multi-packet transfers.

For IN pipes, MULTI_PACKET_SIZE holds the total number of bytes sent. MULTI_PACKET_SIZE should

be written to zero when setting up a new transfer.

For OUT pipes, MULTI_PACKET_SIZE holds the total data size for the complete transfer. This value must

be a multiple of the maximum packet size.

Bits 13:8 – BYTE_COUNT[5:0] Byte Count

These bits define the 14-bit value that contains number of bytes sent in the last OUT or SETUP

transaction for an OUT pipe, or of the number of bytes to be received in the next IN transaction for an

input pipe.

SAM D21 Family

USB – Universal Serial Bus

Datasheet Complete

DS40001882D-page 885