Sfr Definition 23.3. Usb0Dat: Usb0 Data - Silicon Laboratories C8051T620 Manual

SFR Definition 23.3. USB0DAT: USB0 Data

Bit 7
Name
Type
0
Reset
SFR Address = 0x97
Bit Name
7:0 USB0DAT[7:0] USB0 Data Bits.
This SFR is used to indi-
rectly read and write
USB0 registers.
C8051T620/1/6/7 & C8051T320/1/2/3
6 5 4
USB0DAT[7:0]
0 0 0
Description
Write Procedure:
1. Poll for BUSY
(USB0ADR.7) => 0.
2. Load the target USB0
register address into the
USBADDR bits in register
USB0ADR.
3. Write data to USB0DAT.
4. Repeat (Step 2 may be
skipped when writing to
the same USB0 register).
Rev. 1.2
3 2
R/W
0 0
Write
Read Procedure:
1. Poll for BUSY
(USB0ADR.7) => 0.
2. Load the target USB0
register address into the
USBADDR bits in register
USB0ADR.
3. Write 1 to the BUSY bit
in register USB0ADR
(steps 2 and 3 can be per-
formed in the same write).
4. Poll for BUSY
(USB0ADR.7) => 0.
5. Read data from
USB0DAT.
6. Repeat from Step 2
(Step 2 may be skipped
when reading the same
USB0 register; Step 3 may
be skipped when the
AUTORD bit
(USB0ADR.6) is logic 1).
1 0
0 0
Read
165