參數(shù)資料
型號： SAK-C164CM-4RF
廠商： INFINEON TECHNOLOGIES AG
英文描述： 16-Bit Single-Chip Microcontrol ler
中文描述： 16位單芯片Microcontrol萊爾
文件頁數(shù)： 54/68頁
文件大?。?/td> 1107K
代理商： SAK-C164CM-4RF
C164CM
C164SM
Data Sheet
50
V1.0, 2001-05
Due to this adaptation to the input clock the frequency of
f
CPU
is constantly adjusted so
it is locked to
f
OSC
. The slight variation causes a jitter of
f
CPU
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 D
N
:
(
N
×
TCL)
min
=
N
×
TCL
NOM
- D
N
; D
N
[ns] =
±
(13.3 +
N
×
6.3)/
f
CPU
[MHz],
where
N
= number of consecutive TCLs and 1
≤
N
≤
40.
So for a period of 3 TCLs @ 25 MHz (i.e.
N
= 3): D
3
= (13.3 +
3
×
6.3)/25 = 1.288 ns,
and (3TCL)
min
= 3TCL
NOM
- 1.288 ns = 58.7 ns (@
f
CPU
= 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
1
10
20
40
This approximated formula is valid for
1
N
<
f
CPU
<
10 MHz
16 MHz
20 MHz
25 MHz
30
<
–
–
<
–
–
相關(guān)PDF資料
PDF描述
SAF-C164CM-4RF 16-Bit Single-Chip Microcontrol ler
SAF-C164CL-6R25M 16-Bit Single-Chip Microcontroller
SAF-C164CL-6RM 16-Bit Single-Chip Microcontroller
SAF-C164CL-8RM 16-Bit Single-Chip Microcontroller
SAF-C164SI-8R25M 16-Bit Single-Chip Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAK-C164CS-16FF 制造商:Infineon Technologies AG 功能描述:
SAK-C164SI-8R25M 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller
SAK-C164SI-8RM 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller
SAK-C164SL-6R25M 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller
SAK-C164SL-6RM 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller
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