C8051F340-GQR Silicon Laboratories Inc, C8051F340-GQR Datasheet - Page 172

• 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
16.8. Interrupts
The read-only USB0 interrupt flags are located in the USB registers shown in USB Register
Definition 16.11 through USB Register Definition 16.13. The associated interrupt enable bits are located in
the USB registers shown in USB Register Definition 16.14 through USB Register Definition 16.16. A USB0
interrupt is generated when any of the USB interrupt flags is set to ‘1’. The USB0 interrupt is enabled via
the EIE1 SFR (see
Important Note: Reading a USB interrupt flag register resets all flags in that register to ‘0’.
172
Bits7-0:
Bits7-3:
Bits2-0:
Bit7
Bit7
R
R
-
USB Register Definition 16.10. FRAMEH: USB0 Frame Number High
USB Register Definition 16.9. FRAMEL: USB0 Frame Number Low
Frame Number Low
This register contains bits7-0 of the last received frame number.
Unused. Read = 0. Write = don’t care.
Frame Number High Byte
This register contains bits10-8 of the last received frame number.
Bit6
Bit6
R
R
-
Section “9.3. Interrupt Handler” on page 88
Bit5
Bit5
R
R
-
Frame Number Low
Bit4
Bit4
R
R
-
Rev. 1.3
Bit3
Bit3
R
R
-
Bit2
Bit2
R
R
Frame Number High
).
Bit1
Bit1
R
R
Bit0
Bit0
R
R
USB Address:
USB Address:
00000000
00000000
Reset Value
Reset Value
0x0C
0x0D