C8051F330DK Silicon Laboratories Inc, C8051F330DK Datasheet - Page 112
C8051F330DK
Manufacturer Part Number
C8051F330DK
Description
DEV KIT FOR C8051F330/F331
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F330DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F33x
Interface Type
RS-232
Operating Supply Voltage
7 V to 15 V
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F330
Silicon Family Name
C8051F33x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F330, C8051F331
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1264
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C8051F330/1/2/3/4/5
13.3. External Oscillator Drive Circuit
The external oscillator circuit may drive an external crystal, ceramic resonator, capacitor, or RC network. A
CMOS clock may also provide a clock input. For a crystal or ceramic resonator configuration, the crys-
tal/resonator must be wired across the XTAL1 and XTAL2 pins as shown in Option 1 of Figure 13.1. A
10 Mresistor also must be wired across the XTAL2 and XTAL1 pins for the crystal/resonator configura-
tion. In RC, capacitor, or CMOS clock configuration, the clock source should be wired to the XTAL2 pin as
shown in Option 2, 3, or 4 of Figure 13.1. The type of external oscillator must be selected in the OSCXCN
register, and the frequency control bits (XFCN) must be selected appropriately (see SFR Definition 13.4).
Important Note on External Oscillator Usage: Port pins must be configured when using the external
oscillator circuit. When the external oscillator drive circuit is enabled in crystal/resonator mode, Port pins
P0.2 and P0.3 are used as XTAL1 and XTAL2 respectively. When the external oscillator drive circuit is
enabled in capacitor, RC, or CMOS clock mode, Port pin P0.3 is used as XTAL2. The Port I/O Crossbar
should be configured to skip the Port pins used by the oscillator circuit; see
Section “14.1. Priority Cross-
bar Decoder” on page 125
for Crossbar configuration. Additionally, when using the external oscillator cir-
cuit in crystal/resonator, capacitor, or RC mode, the associated Port pins should be configured as analog
inputs . In CMOS clock mode, the associated pin should be configured as a digital input . See
Section
“14.2. Port I/O Initialization” on page 127
for details on Port input mode selection.
116
Rev. 1.7
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