C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 119

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• 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: -

Bit7:
Bit6:
Bit5:
Bits4-2:
Bits1-0:
Bits4-0:
Note: The contents of this register are undefined when Clock Recovery is enabled. See
Clock Configuration” on page 150
IOSCEN
R/W
R/W
Bit7
Bit7
-
IOSCEN: Internal Oscillator Enable Bit.
0: Internal Oscillator Disabled.
1: Internal Oscillator Enabled.
IFRDY: Internal Oscillator Frequency Ready Flag.
0: Internal Oscillator is not running at programmed frequency.
1: Internal Oscillator is running at programmed frequency.
SUSPEND: Force Suspend
Writing a ‘1’ to this bit will force the internal oscillator to be stopped. The oscillator will be re-started
on the next non-idle USB event (i.e., RESUME signaling) or VBUS interrupt event (see Figure 8.5).
UNUSED. Read = 000b, Write = don't care.
IFCN1-0: Internal Oscillator Frequency Control Bits.
00: SYSCLK derived from Internal Oscillator divided by 8.
01: SYSCLK derived from Internal Oscillator divided by 4.
10: SYSCLK derived from Internal Oscillator divided by 2.
11: SYSCLK derived from Internal Oscillator divided by 1.
OSCCAL: Oscillator Calibration Value
These bits determine the internal oscillator period as per Equation 13.1.
IFRDY
Figure 13.3. OSCICL: Internal Oscillator Calibration Register
R/W
Bit6
Bit6
R
-
Figure 13.2. OSCICN: Internal Oscillator Control Register
SUSPEND
R/W
R/W
Bit5
Bit5
-
for details on Clock Recovery.
R/W
Bit4
Bit4
R
-
R/W
R/W
Bit3
Bit3
-
Rev. 1.1
OSCCAL
R/W
R/W
Bit2
Bit2
-
IFCN1
R/W
R/W
Bit1
Bit1
C8051F320/1
IFCN0
Section “15.4. USB
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
00010100
Reset Value
Reset Value
Variable
0xB2
0xB3
119