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參數(shù)資料
| 型號： | SAK-C167CR-LM |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-Bit CMOS Single-Chip Microcontroller |
| 中文描述： | 16-BIT, 20 MHz, MICROCONTROLLER, PQFP144 |
| 文件頁數(shù)： | 48/67頁 |
| 文件大?。?/td> | 809K |
| 代理商： | SAK-C167CR-LM |
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C167CR
Semiconductor Group
45
Phase Locked Loop
When pin P0.15 (P0H.7) is high (‘1’) during reset the on-chip phase locked loop is enabled and
provides the CPU clock. The PLL multiplies the input frequency by 4 (i.e.
f
CPU
=
f
XTAL
×
4). With every
fourth transition of
f
XTAL
the PLL circuit synchronizes the CPU clock to the input clock. This
synchronization is done smoothly, i.e. the CPU clock frequency does not change abruptly.
Due to this adaptation to the input clock the frequency of
f
CPU
is constantly adjusted so it is locked
to
f
XTAL
. 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 below).
For a period of
N
×
TCL the minimum value is computed using the corresponding deviation D
N
:
TCL
min
= TCL
NOM
×
(1 – D
N
/ 100)
D
N
=
±
(4 –
N
/15) [%],
where
N
= number of consecutive TCLs
and 1
≤
N
≤
40.
So for a period of 3 TCLs (i.e.
N
= 3): D
3
= 4 –
3
/15 = 3.8 %,
and TCL
min
= TCL
NOM
×
(1 – 3.8 / 100) = TCL
NOM
×
0.962 (24.1 nsec @
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 neglectible.
Figure 12
Approximated Maximum PLL Jitter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAK-C167CS-4R33M | 16-Bit Single-Chip Microcontroller |
| SAK-C167CS-L33M | 16-Bit Single-Chip Microcontroller |
| SAB-C167CS-L33M | 16-Bit Single-Chip Microcontroller |
| SAK-C167CS-4RM | 16-Bit Single-Chip Microcontroller |
| SAK-C167CS-LM | 16-Bit Single-Chip Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAK-C167CR-LM HA | 制造商:Infineon Technologies AG 功能描述:16BIT CMOS CPU AUTO TEM MQFP144 制造商:Infineon Technologies AG 功能描述:16BIT CMOS CPU AUTO TEM, MQFP144 制造商:Infineon Technologies AG 功能描述:IC, 16BIT MCU, C166, 25MHZ, 144-MQFP; Controller Family/Series:C166; Core Size:16bit; No. of I/O's:111; Supply Voltage Min:2.5V; Supply Voltage Max:5.5V; Digital IC Case Style:MQFP; No. of Pins:144; RAM Memory Size:4KB ;RoHS Compliant: Yes 制造商:Infineon Technologies 功能描述:MCU 16-bit C166 CISC/RISC ROMLess 5V 144-Pin MQFP |
| SAK-C167CR-LM HA+ | 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(shí)鐘頻率:24 MHz 程序存儲(chǔ)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 |
| SAK-C167CR-LM-ES-HA | 制造商:Infineon Technologies AG 功能描述: |
| SAK-C167CR-LMGA-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Siemens 功能描述: |
| SAKC167CRLM-GAT6 | 制造商:Infineon Technologies AG 功能描述:MCU 16-Bit C166 CISC/RISC ROMLess 5V 144-Pin MQFP |
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