Datasheet

32.8.4.3 Packet Size
Name: PCKSIZE
Offset: 0x04 & 0x14
Reset: 0xxxxxxxxx
Property: NA
Bit 31 30 29 28 27 26 25 24
AUTO_ZLP SIZE[2:0] MULTI_PACKET_SIZE[13:10]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset x 0 0 x 0 0 0 0
Bit 23 22 21 20 19 18 17 16
MULTI_PACKET_SIZE[9:2]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8
MULTI_PACKET_SIZE[1:0] BYTE_COUNT[13:8]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 x 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
BYTE_COUNT[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 x
Bit 31 – AUTO_ZLP Automatic Zero Length Packet
This bit defines the automatic Zero Length Packet mode of the endpoint.
When enabled, the USB module will manage the ZLP handshake by hardware. This bit is for IN endpoints
only. When disabled the handshake should be managed by firmware.
Value Description
0
Automatic Zero Length Packet is disabled.
1
Automatic Zero Length Packet is enabled.
Bits 30:28 – SIZE[2:0] Endpoint size
These bits contains the maximum packet size of the endpoint.
Value Description
0x0 8 Byte
0x1 16 Byte
0x2 32 Byte
0x3 64 Byte
0x4 128 Byte
(1)
SAM D21 Family
USB – Universal Serial Bus
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 852