參數(shù)資料
型號： SAFC161S
廠商： INFINEON TECHNOLOGIES AG
英文描述： 16-Bit Single-Chip Microcontroller
中文描述： 16位單片機(jī)
文件頁數(shù)： 50/75頁
文件大小： 1315K
代理商： SAFC161S
C161S
Timing Characteristics
Data Sheet
46
V1.0, 2003-11
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 11
).
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]
(1)
where
N
= number of consecutive TCLs and 1
≤
N
≤
40.
So for a period of 3 TCLs @ 20 MHz (i.e.
N
= 3): D
3
= (13.3 +
3
×
6.3) / 20 = 1.61 ns,
and (3TCL)
min
= 3TCL
NOM
- 1.61 ns = 73.39 ns (@
f
CPU
= 20 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 negligible.
Note: For all periods longer than 40 TCL the N = 40 value can be used (see
Figure 11
).
Figure 11
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF-C161S 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller
SAF-C161S-L25M 制造商:Infineon Technologies AG 功能描述:IC 16BIT MCU ROM/ROMLESS SMD 161
SAF-C161S-L25M AA 功能描述:16位微控制器 - MCU 16-Bit Single-Chip 5V 25MHz ROM less RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
SAF-C161S-L25M AATR 制造商:Infineon Technologies AG 功能描述:
SAFC161SL25MAAXT 制造商:Infineon Technologies AG 功能描述:MCU 16-Bit C166 CISC/RISC ROMLess 5V 80-Pin MQFP
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