c8051f410 Silicon Laboratories, c8051f410 Datasheet - Page 165
c8051f410
Manufacturer Part Number
c8051f410
Description
2.0 V, 32/16 Kb Flash, Smartclock, 12-bit Adc
Manufacturer
Silicon Laboratories
Datasheet
1.C8051F410.pdf
(270 pages)
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19. Oscillators
C8051F41x devices include a programmable internal oscillator, an external oscillator drive circuit, and a
Clock Multiplier. The internal oscillator can be enabled/disabled and calibrated using the OSCICN and
OSCICL registers, as shown in Figure 19.1. The system clock (SYSCLK) can be derived from the internal
oscillator, external oscillator circuit, or smaRTClock oscillator. The clock multiplier can produce three possi-
ble base outputs which can be scaled by a programmable factor of 1, 2/3, 2/4 (or 1/2), 2/5, 2/6 (or 1/3), or
2/7: Internal Oscillator x 2, External Oscillator x 2, or External Oscillator x 4. Oscillator electrical specifica-
tions are given in Table 19.1 on page 175.
19.1. Programmable Internal Oscillator
All C8051F41x 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, shown in SFR
Definition 19.2. On C8051F41x devices, OSCICL is factory calibrated to obtain a 24.5 MHz frequency.
Electrical specifications for the precision internal oscillator are given in Table 19.1 on page 175. Note that
the system clock may be derived from the programmed internal oscillator divided by 1, 2, 4, 8, 16, 32, 64,
or 128 as defined by the IFCN bits in register OSCICN. The divide value defaults to 128 following a reset.
VDD
Option 2
XTAL2
Option 1
Option 4
10MΩ
XTAL2
Option 3
XTAL2
XTAL1
XTAL2
Figure 19.1. Oscillator Diagram
OSCICL
Circuit
Input
Programmable
Internal Clock
Generator
OSCXCN
OSC
EN
Rev. 1.0
EXOSC / 2
OSCICN
IOSC
EXOSC
EXOSC
IOSC/2
IOSC
CLKMUL
n
Clock Multiplier
x4
C8051F410/1/2/3
n
smaRTClock
Oscillator
CLKSEL
SYSCLK
165
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