C8051F38B-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F38B-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

SFR Definition 21.3. USB0DAT: USB0 Data

Bit

7

6

5

4

3

2

1

0

Name

USB0DAT[7:0]

Type

R/W

Reset

0

0

0

0

0

0

0

0

SFR Address = 0x97; SFR Page = All Pages

Bit

Name

Description

7:0 USB0DAT[7:0] USB0 Data Bits.

This SFR is used to indi-

rectly read and write

USB0 registers.

Write

Read

Write Procedure:

Read Procedure:

1. Poll for BUSY

1. Poll for BUSY

(USB0ADR.7) => 0.

(USB0ADR.7) => 0.

2. Load the target USB0 2. Load the target USB0

register address into the register address into the

USBADDR bits in register USBADDR bits in register

USB0ADR.

USB0ADR.

3. Write data to USB0DAT. 3. Write 1 to the BUSY bit

4. Repeat (Step 2 may be in register USB0ADR

skipped when writing to (steps 2 and 3 can be per-

the same USB0 register). formed in the same write).

4. Poll for BUSY

(USB0ADR.7) => 0.

5. Read data from USB0-

DAT.

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).

Rev. 1.4

177

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