參數(shù)資料
型號: SAB-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): 61/80頁
文件大?。?/td> 1151K
代理商: SAB-C167CR-LM
C167CS-4R
C167CS-L
Data Sheet
57
V2.0, 2000-06
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
±1
±10
1
5
10
20
D
N
±20
±26.5
ns
±30
40 and 10 MHz
This approximated formula is valid for
1
N
33 MHz.
CPU
f
25 MHz
33 MHz
40
MCD04413
N
16 MHz
20 MHz
10 MHz
Max. jitter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SABC167CRLM HA+ 制造商:Infineon Technologies AG 功能描述:
SAB-C167CR-LM HA+ 功能描述:16位微控制器 - MCU 16BIT ROM/ROMLESS 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 安裝風格:SMD/SMT
SABC167CRLM HA+TR 制造商:Infineon Technologies AG 功能描述:
SAB-C167CR-LMBA 制造商:Siemens 功能描述:Part Number Only
SAB-C167CR-LMGA 制造商:Infineon Technologies AG 功能描述:16-BIT, MROM, 25 MHZ, MICROCONTROLLER, PQFP144