C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 125

• 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: -

Bit 7:
Bits6-4:
Bits3-2:
Bits1-0:
R/W
Bit7
-
Unused. Read = 0b; Write = don’t care.
USBCLK2-0: USB Clock Select
These bits select the clock supplied to USB0. When operating USB0 in full-speed mode, the selected
clock should be 48 MHz. When operating USB0 in low-speed mode, the selected clock should be
6 MHz.
Unused. Read = 00b; Write = don’t care.
CLKSL1-0: System Clock Select
These bits select the system clock source.
R/W
Bit6
USBCLK
CLKSL
000
001
010
011
100
101
110
111
00
01
10
11
USBCLK
Figure 13.6. CLKSEL: Clock Select Register
R/W
Bit5
R/W
Bit4
Internal Oscillator (as determined by the IFCN
bits in register OSCICN)
R/W
Bit3
4x Clock Multiplier / 2
External Oscillator / 2
External Oscillator / 3
External Oscillator / 4
Internal Oscillator / 2
-
4x Clock Multiplier
Rev. 1.1
External Oscillator
External Oscillator
Selected Clock
Selected Clock
RESERVED
RESERVED
RESERVED
R/W
Bit2
-
R/W
Bit1
CLKSL
C8051F320/1
R/W
Bit0
SFR Address
00000000
Reset Value
0xA9
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