C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 157

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1067-2

15.8. Interrupts
The read-only USB0 interrupt flags are located in the USB registers shown in Figure 15.14 through Figure 15.16. The
associated interrupt enable bits are located in the USB registers shown in Figure 15.17 through Figure 15.19. 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’.
Bits7-4:
Bit3:
Bit2:
Bit1:
Bit0:
Bit7
R
-
Section “9.3. Interrupt Handler” on page
Unused. Read = 0000b. Write = don’t care.
IN3: IN Endpoint 3 Interrupt-pending Flag
This bit is cleared when software reads the IN1INT register.
0: IN Endpoint 3 interrupt inactive.
1: IN Endpoint 3 interrupt active.
IN2: IN Endpoint 2 Interrupt-pending Flag
This bit is cleared when software reads the IN1INT register.
0: IN Endpoint 2 interrupt inactive.
1: IN Endpoint 2 interrupt active.
IN1: IN Endpoint 1 Interrupt-pending Flag
This bit is cleared when software reads the IN1INT register.
0: IN Endpoint 1 interrupt inactive.
1: IN Endpoint 1 interrupt active.
EP0: Endpoint 0 Interrupt-pending Flag
This bit is cleared when software reads the IN1INT register.
0: Endpoint 0 interrupt inactive.
1: Endpoint 0 interrupt active.
Figure 15.14. IN1INT: USB0 IN Endpoint Interrupt (USB Register)
Bit6
R
-
Bit5
R
-
Bit4
R
-
87).
IN3
Bit3
R
Rev. 1.1
IN2
Bit2
R
IN1
Bit1
R
C8051F320/1
EP0
Bit0
R
USB Address:
00000000
Reset Value
0x02
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