External clock drive waveforms, External clock drive, Wire serial interface characteristics – Rainbow Electronics ATmega163L User Manual
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ATmega163(L)
140
External Clock Drive Waveforms
Figure 89. External Clock Drive Waveforms
External Clock Drive
Note:
R should be in the range 3k
Ω - 100kΩ, and C should be at least 20pF. The C values given in the table includes pin capacitance.
This will vary with package type.
2-wire Serial Interface Characteristics
Table 64 describes the requirements for devices connected to the 2-wire Serial Bus. The ATmega163 2-wire Serial Inter-
face meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 90.
Table 62. External Clock Drive
Symbol
Parameter
V
CC
= 2.7V to
5.5
V
V
CC
= 4.0V to
5.5
V
Units
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency
0
4
0
8
MHz
t
CLCL
Clock Period
250
125
ns
t
CHCX
High Time
100
50
ns
t
CLCX
Low Time
100
50
ns
t
CLCH
Rise Time
1.6
0.5
µs
t
CHCL
Fall Time
1.6
0.5
µs
Table 63. External RC Oscillator, typical frequencies
R [k
Ω]
C [pF]
f
100
70
100 kHz
31.5
20
1.0 MHz
6.5
20
4.0 MHz