Specifications

V850E2/MN4 USB CDC (Communication Device Class) Driver
R01AN0010EJ0101 Rev.1.01 Page 21 of 117
Feb 01, 2012
(5)
String Descriptor
This descriptor is sent in response to a GET_DESCRIPTOR_string request.
When the sample driver receives a GET_DESCRIPTOR_string request, it fetches the string descriptor settings from the
header file named “usbf850_desc.h” and stores them in the USFA0E0W registers of the USB function controller.
Table 4.8 String Descriptor Settings
(a) String 0
Field
Size
(Bytes) Value Description
bLength 1 0x04 Size of the descriptor: 4 bytes
bDescriptorType 1 0x03 Type of the descriptor: String
bString 2 0x09, 0x04 Language code: English (U.S.)
(b) String 1
Field
Size
(Bytes) Value Description
bLength
*
1
1 0x30 Size of the descriptor: 42 bytes
bDescriptorType 1 0x03 Type of the descriptor: String
bString
*
2
46 — Vendor: Renesas Electronics Co.
Notes: 1. The value varies with the size of the bString field.
2. The size and value are not fixed because this area can be set up arbitrarily by the vendor.
(c) String 2
Field
Size
(Bytes) Value Description
bLength
*
1
1 0x0E Size of the descriptor: 14 bytes
bDescriptorType 1 0x03 Type of the descriptor: String
bString
*
2
12 — Product type: CDCDrv (CDC driver)
Notes: 1. The value varies with the size of the bString field.
2. The size and value are not fixed because this area can be set up arbitrarily by the vendor.
(d) String 3
Field
Size
(Bytes) Value Description
bLength
*
1
1 0x16 Size of the descriptor: 24 bytes
bDescriptorType 1 0x03 Type of the descriptor: String
bString
*
2
22 — Serial number:
V850E2/MN4: 020002020010
Notes: 1. The value varies with the size of the bString field.
2. The size and value are not fixed because this area can be set up arbitrarily by the vendor.