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23.4.1
Clock Timing
Table 23-4 lists the clock timing
Table 23-4 Clock Timing
Condition :
V
= PWMV
CC
V
= 4.5 V to AV
ref
+75°C (regular specifications), T
Item
Clock cycle time
Clock high pulse width
Clock low pulse width
Clock rise time
Clock fall time
Clock oscillator settling
time at reset (crystal)
Clock oscillator settling time in
software standby (crystal)
Sub clock oscillator settling time
Sub clock oscillator frequency
Sub clock (ø
) cycle time
SUB
= 4.5 V to 5.5 V, LPV
CC
, V
= PWMV
CC
SS
= –40°C to +85°C (wide-range specifications)
a
Symbol Min
t
50
cyc
t
25
CH
t
25
CL
t
—
Cr
t
—
Cf
t
20
OSC1
t
8
OSC2
t
—
OSC3
f
32.768
SUB
f
30.5
SUB
= 4.5 V to 5.5 V, AV
CC
= PLLV
= AV
SS
SS
SS
Condition
Max
Unit
250
ns
—
ns
—
ns
10
ns
10
ns
—
ms
—
ms
2
s
kHz
µs
= 4.5 V to 5.5 V,
CC
= 0 V, T
= –20°C to
a
Test Conditions
Figure 23-3
Figure 23-4
Figure 22-3
Figure 23-4
761
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