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| 型號： | SAF-C164SV-2R25F |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 47/65頁 |
| 文件大?。?/td> | 932K |
| 代理商： | SAF-C164SV-2R25F |
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C164SV
Data Sheet
47
V1.0, 2003-04
Preliminary
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 11).
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 11).
Figure 11
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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–
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF-C164SV-2RF | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit Single-Chip Microcontroller |
| SAFC165H | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:EMBEDDED C166 WITH USART IOM-2 AND HDLC SUPPORT |
| SAF-C165H-LF V1.3 | 功能描述:16位微控制器 - MCU IC COMM CTRLR RISC ROMLESS 36MHZ 3.3V 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 |
| SAFC165H-LF V1.3TR | 制造商:Lantiq 功能描述: |
| SAFC165HLFV1.3 | 制造商:Lantiq 功能描述: 制造商:Rochester Electronics LLC 功能描述: 制造商:Infineon Technologies AG 功能描述: |
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