C8051F040-TB Silicon Laboratories Inc, C8051F040-TB Datasheet - Page 173

• Manufacturer Part Number: C8051F040-TB
• Description: BOARD PROTOTYPING W/C8051F040
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F040-TB

• Contents: Board
• Processor To Be Evaluated: C8051F04x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F040
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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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