at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 208
at91cap7e
Manufacturer Part Number
at91cap7e
Description
Customizable Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.AT91CAP7E.pdf
(520 pages)
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Figure 24-2. Main Oscillator Block Diagram
24.1.4.1
Figure 24-3. Typical Crystal Connection
24.1.4.2
24.1.4.3
208
AT91CAP7E
Main Oscillator Connections
Main Oscillator Startup Time
Main Oscillator Control
The Clock Generator integrates a Main Oscillator that is designed for a
crystal. The typical crystal connection is illustrated in
trical characteristics of the Main Oscillator, see the section “DC Characteristics” of the product
datasheet.
The startup time of the Main Oscillator is given in the DC Characteristics section of the product
datasheet. The startup time depends on the crystal frequency and decreases when the fre-
quency rises.
To minimize the power required to start up the system, the main oscillator is disabled after reset
and slow clock is selected.
The software enables or disables the main oscillator so as to reduce power consumption by
clearing the MOSCEN bit in the Main Oscillator Register (CKGR_MOR).
Slow Clock
XOUT
SLCK
XIN
XIN
CAP7 Microcontroller
Main Clock
OSCOUNT
Frequency
Oscillator
MOSCEN
Oscillator
XOUT
Counter
Counter
Main
Main
1K
GND
Main Clock
MAINCK
Figure
MAINRDY
MOSCS
MAINF
24-3. For further details on the elec-
8 to 16
MHz fundamental
8549A–CAP–10/08
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