at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 763

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

41.4
41.4.1
Table 41-5.
41.4.2
Master Clock Waveform Parameters
Note:
41.4.3
Table 41-6.
Note:
6384B–ATARM–15-Dec-08
Symbol
1/(t
Symbol
1/(t
Symbol
1/(t
t
t
t
C
R
CPXIN
CHXIN
CLXIN
IN
IN
CPPCK
CPMCK
CPXIN
Clock Characteristics
1.
1. These characteristics apply only when the Main Oscillator is in bypass mode (i.e. when MOSCEN = 0 and OSCBYPASS = 1)
)
)
)
Processor Clock Characteristics
Master Clock Characteristics
XIN Clock Characteristics
The system clock is the maximum clock at which the system is able to run. It is given by
processor clock, internal bus clock, EBI clock.
in the CKGR_MOR register. See “PMC Clock Generator Main Oscillator Register” in the PMC section.
Processor Clock Waveform Parameters
XIN Clock Electrical Characteristics
Parameter
Processor Clock Frequency
Parameter
Master Clock Frequency
Parameter
XIN Clock Frequency
XIN Clock Period
XIN Clock High Half-period
XIN Clock Low Half-period
XIN Input Capacitance
XIN Pull-down Resistor
Conditions
V
T = 85°C
Conditions
V
T = 85°C
VDDCORE
VDDCORE
Conditions
= 0.9V
= 0.9V
(1)
(1)
AT91SAM9G20 Preliminary
0.4 x t
0.4 x t
Min
Min
Min
20
CPXIN
CPXIN
0.6 x t
0.6 x t
1000
Max
Max
Max
the smallest value the of
400
133
50
25
CPXIN
CPXIN
MHz
ns
ns
ns
pF
kΩ
Units
Units
Units
MHz
MHz
763