C8051F040DK Silicon Laboratories Inc, C8051F040DK Datasheet - Page 173

• Manufacturer Part Number: C8051F040DK
• Description: DEV KIT FOR F040/F041/F042/F043
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F040DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F04x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F040
• Silicon Family Name: C8051F04x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051 F040, 041, 042, 043 MCUs
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1205

14. Oscillators
14.1. Programmable Internal Oscillator
All C8051F04x devices include a programmable internal oscillator that defaults as the system clock after a
system reset. The internal oscillator period can be programmed via the OSCICL register as defined by
SFR Definition 14.1. OSCICL is factory calibrated to obtain a 24.5 MHz frequency.
Electrical specifications for the precision internal oscillator are given in Table 14.1 on page 175. The pro-
grammed internal oscillator frequency must not exceed 25 MHz. The system clock may be derived from
the programmed internal oscillator divided by 1, 2, 4, or 8, as defined by the IFCN bits in register OSCICN.
VDD
Option 3
Option 2
XTAL1
XTAL1
XTAL2
Option 1
Option 4
XTAL1
Figure 14.1. Oscillator Diagram
XTAL1
XTAL2
OSCICL
Rev. 1.5
Circuit
Programmable
Input
Internal Clock
Generator
OSCXCN
C8051F040/1/2/3/4/5/6/7
EN
OSC
OSCICN
n
CLKSEL
1
0
SYSCLK
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