C8051F326DK Silicon Laboratories Inc, C8051F326DK Datasheet - Page 90

• Manufacturer Part Number: C8051F326DK
• Description: KIT DEV FOR C8051F326/7
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F326DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F326/F327
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F326
• Silicon Family Name: C8051F32x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051F326, C8051F327
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1306

C8051F326/7
12.3. USB Register Access
The USB0 controller registers listed in Table 12.2 are accessed through two SFRs: USB0 Address
(USB0ADR) and USB0 Data (USB0DAT). The USB0ADR register selects which USB register is targeted
by reads/writes of the USB0DAT register. See Figure 12.2.
Endpoint control/status registers are accessed by first writing the USB register INDEX with the target end-
point number. Once the target endpoint number is written to the INDEX register, the control/status registers
associated with the target endpoint may be accessed. See the “Indexed Registers” section of Table 12.2
for a list of endpoint control/status registers.
Important Note: The USB clock must be active when accessing USB registers.
90
USB0ADR
USB0DAT
SFRs
8051
Figure 12.2. USB0 Register Access Scheme
Rev. 1.1
Registers
Registers
Common
Interrupt
Register
Access
Index
FIFO
USB Controller
Endpoint0 Control/
Endpoint1 Control/
Status Registers
Status Registers