C8051F340-GQR Silicon Laboratories Inc, C8051F340-GQR Datasheet - Page 164

• Manufacturer Part Number: C8051F340-GQR
• Description: MCU 8-Bit C8051F34x 8051 CISC 64KB Flash 3.3V/5V 48-Pin TQFP T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F340-GQR

• Package: 48TQFP
• Device Core: 8051
• Family Name: C8051F34x
• Maximum Speed: 48 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 40
• Interface Type: I2C/SMBus/SPI/UART/USB
• On-chip Adc: 17-chx10-bit
• Number Of Timers: 4
• Ram Size: 4.25 KB
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Operating Temperature: -40 to 85 °C

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
164
R/W
Bit7
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
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
same write).
may be skipped when the AUTORD bit (USB0ADR.6) is logic 1).
R/W
Bit6
SFR Definition 16.3. USB0DAT: USB0 Data
R/W
Bit5
R/W
Bit4
USB0DAT
Rev. 1.3
R/W
Bit3
R/W
Bit2
R/W
Bit1
R/W
Bit0
SFR Address:
00000000
Reset Value
0x97