C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 119
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
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
-
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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
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