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V850E2/MN4 USB CDC (Communication Device Class) Driver

R01AN0010EJ0101 Rev.1.01 Page 15 of 117

Feb 01, 2012

Table 3.6 Interface Descriptor Format

Field

Size

(Bytes) Description

bLength 1 Size of the descriptor

bDescriptorType 1 Type of the descriptor

bInterfaceNumber 1 Identification number of this interface

bAlternateSetting 1 Presence or absence of alternate setting for this interface

bNumEndpoints 1 Number of endpoints used by this interface

bInterfaceClass 1 Class code

bInterfaceSubClass 1 Subclass code

bInterfaceProtocol 1 Protocol code

iInterface 1 Index of the string descriptor describing this interface

Table 3.7 Endpoint Descriptor Format

Field

Size

(Bytes) Description

bLength 1 Size of the descriptor

bDescriptorType 1 Type of the descriptor

bEndpointAddress 1

Transfer direction of this endpoint

Address of this endpoint

bmAttributes 1 Transfer type of this endpoint

wMaxPacketSize 2 Maximum packet size available for transfer at this endpoint

bInterval 1 Interval for polling this endpoint

Table 3.8 String Descriptor Format

Field

Size

(Bytes) Description

bLength 1 Size of the descriptor

bDescriptorType 1 Type of the descriptor

bString Arbitrary Arbitrary data string

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 119 120

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