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| 型号： | SAF-C164SL-8RM |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.65 MM PITCH, METRIC, PLASTIC, QFP-80 |
| 文件页数： | 52/79页 |
| 文件大小： | 1314K |
| 代理商： | SAF-C164SL-8RM |
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C164CI/SI
C164CL/SL
Data Sheet
52
V2.0, 2001-05
Due to this adaptation to the input clock the frequency of
fCPU is constantly adjusted so
it is locked to
fOSC. The slight variation causes a jitter of fCPU which also effects the
duration of individual TCLs.
The timings listed in the AC Characteristics that refer to TCLs therefore must be
calculated using the minimum TCL that is possible under the respective circumstances.
The actual minimum value for TCL depends on the jitter of the PLL. As the PLL is
constantly adjusting its output frequency so it corresponds to the applied input frequency
(crystal or oscillator) the relative deviation for periods of more than one TCL is lower than
for one single TCL (see formula and Figure 12).
For a period of
N
× TCL the minimum value is computed using the corresponding
deviation DN:
(
N
× TCL)min = N × TCLNOM - DN; DN [ns] = ±(13.3 + N × 6.3)/fCPU [MHz],
where
N = number of consecutive TCLs and 1
≤ N ≤ 40.
So for a period of 3 TCLs @ 25 MHz (i.e.
N = 3): D3 = (13.3 + 3 × 6.3)/25 = 1.288 ns,
and (3TCL)min = 3TCLNOM - 1.288 ns = 58.7 ns (@ fCPU = 25 MHz).
This is especially important for bus cycles using waitstates and e.g. for the operation of
timers, serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train
generation or measurement, lower baudrates, etc.) the deviation caused by the PLL jitter
is neglectible.
Note: For all periods longer than 40 TCL the N = 40 value can be used (see Figure 12).
Figure 12
Approximated Maximum Accumulated PLL Jitter
MCD04455
N
Max. jitter
D
N
±1
±10
±20
±30
ns
±26.5
110
20
40
This approximated formula is valid for
1
N
40 and 10 MHz
f
CPU
25 MHz.
10 MHz
16 MHz
20 MHz
25 MHz
30
<
–
<
–
<
–
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