參數(shù)資料
型號: DSP56855BUE
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 16-bit Digital Signal Controllers
中文描述: 16位數(shù)字信號控制器
文件頁數(shù): 25/52頁
文件大小: 618K
代理商: DSP56855BUE
External Clock Operation
56855 Technical Data, Rev. 6
Freescale Semiconductor
25
4.5.3
The recommended method of connecting an external clock is given in
Figure 4-8
.
The external clock
source is connected to XTAL and the EXTAL pin is held at V
DDA
/2. The TOD_SEL bit in CGM must be
set to 0.
Low Speed External Clock Source (2-4MHz)
Figure 4-8 Connecting a Low Speed External Clock Signal using XTAL
Figure 4-9 External Clock Timing
Table 4-5 External Clock Operation Timing Requirements
4
Operating Conditions: V
SS
= V
SSIO
= V
SSA
= 0 V, V
DD
= 1.62-1.98V, V
DDIO
= V
DDA
=
3.0–3.6V, T
A
= –40
°
to +120
°
C, C
L
50pF, f
op
= 120MHz
Characteristic
Symbol
Min
Typ
Max
Unit
Frequency of operation (external clock driver)
1
1.
2.
3.
4.
See
Figure 4-7
for details on using the recommended connection of an external clock driver.
External clock input rise time is measured from 10% to 90%.
External clock input fall time is measured from 90% to 10%.
Parameters listed are guaranteed by design.
f
osc
0
240
MHz
Clock Pulse Width
4
t
PW
6.25
ns
External clock input rise time
2, 4
t
rise
TBD
ns
External clock input fall time
3,
4
t
fall
TBD
ns
56855
XTAL
EXTAL
External
Clock
(2-4MHz)
V
DDA
/2
External
Clock
V
IH
V
IL
Note: The midpoint is V
IL
+ (V
IH
– V
IL
)/2.
90%
50%
10%
90%
50%
10%
t
PW
t
PW
t
fall
t
rise
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DSP56857BU120 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 120Mhz/120MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT