520
/
838
Nations Technologies Inc.
Tel
:
+86-755-86309900
:
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Bit Field
Name
Description
31:8
Reserved
Reserved, the reset value must be maintained.
7
EFUC
USB module enable
0: The USB module stops working and does not respond to any USB communication
1: Enable USB module
6
:
0
ADDR[6:0]
USB device address
This bit holds the address value assigned to the USB device by the USB host during
enumeration. After a USB bus reset, this bit is reset to 0x00.
19.5.7
USB packet buffer description table address register (USB_BUFTAB)
Address offset: 0x50
Reset value: 0x0000 0000
Bit Field
Name
Description
31:16
Reserved
Reserved, the reset value must be maintained.
15:3
BUFTAB[12:0]
Buffer table
This bit holds the starting address of the buffer description table. The buffer
description table is used to indicate the address and size of the endpoint packet buffer
of each endpoint, aligned by 8 bytes (the lowest 3 bits are 000).
2:0
Reserved
Reserved, the reset value must be maintained.
Buffer description table
The buffer description table is located in the packet buffer memory and is used to configure the address and size of
the endpoint packet buffer shared by the USB module and the microcontroller core. Since the APB1 bus is addressed
by 32 bits, the data packet buffer memory addresses use 32-bit aligned addresses, not the addresses used by the
USB_BUFTAB register and the buffer description table.