Silicon Laboratories C8051F340 Instrukcja Użytkownika Pobierz pdf (Strona 168)

C8051F340/1/2/3/4/5/6/7

168 Rev. 0.5

SFR Definition 16.3. USB0DAT: USB0 Data

This SFR is used to indirectly read and write USB0 registers.

Write Procedure:

1. Poll for BUSY (USB 0ADR.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).

Read Procedure:

1. Poll for BUSY (USB 0ADR.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 performed in the

same write).

4. Poll for BUSY (USB 0ADR.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).

R/W R/W R/W R/W R/W R/W R/W R/W Reset Value

USB0DAT 00000000

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0x97

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 281 282

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Silicon Laboratories C8051F340 Instrukcja Użytkownika Strona 168