C8051F020DK Silicon Laboratories Inc, C8051F020DK Datasheet - Page 135

• Manufacturer Part Number: C8051F020DK
• Description: DEV KIT FOR F020/F021/F022/F023
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F020DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F02x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F020
• Silicon Family Name: C8051F02x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051 F020/021/022/023
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1200

14.
Each MCU includes an internal oscillator and an external oscillator drive circuit, either of which can generate the sys-
tem clock. The MCUs operate from the internal oscillator after any reset. This internal oscillator can be enabled/dis-
abled and its frequency can be set using the Internal Oscillator Control Register (OSCICN) as shown in Figure 14.1.
The internal oscillator's electrical specifications are given in Table 14.1.
Both oscillators are disabled when the /RST pin is held low. The MCUs can run from the internal oscillator perma-
nently, or can switch to the external oscillator if desired using CLKSL bit in the OSCICN Register. The external oscil-
lator requires an external resonator, crystal, capacitor, or RC network connected to the XTAL1/XTAL2 pins (see
Table 14.1). The oscillator circuit must be configured for one of these sources in the OSCXCN register. An external
CMOS clock can also provide the system clock; in this configuration, the XTAL1 pin is used as the CMOS clock
input. The XTAL1 and XTAL2 pins are NOT 5V tolerant.
OSCILLATORS
opt. 4
XTAL1
opt. 3
XTAL1
XTAL2
AV+
opt. 2
XTAL1
Figure 14.1. Oscillator Diagram
opt. 1
XTAL1
XTAL2
AGND
Rev. 1.4
VDD
AV+
Circuit
Input
OSCXCN
Internal Clock
OSCICN
Generator
EN
OSC
C8051F020/1/2/3
SYSCLK
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