參數(shù)資料
型號(hào): ST10F269Z2Q3
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144
封裝: 28 X 28 MM, PLASTIC, QFP-144
文件頁數(shù): 42/160頁
文件大?。?/td> 1541K
代理商: ST10F269Z2Q3
ST10F269
136/160
21.4 - AC characteristics
21.4.1 - Test Waveforms
21.4.2 - Definition of Internal Timing
The internal operation of the ST10F269 is
controlled by the internal CPU clock fCPU. Both
edges of the CPU clock can trigger internal (for
example pipeline) or external (for example bus
cycles) operations.
The specification of the external timing (AC
Characteristics) therefore depends on the time
between two consecutive edges of the CPU clock,
called “TCL”.
The CPU clock signal can be generated by
different mechanisms. The duration of TCL and its
variation (and also the derived external timing)
depends on the mechanism used to generate
fCPU.
This influence must be regarded when calculating
the timings for the ST10F269.
The example for PLL operation shown in Figure
67 refers to a PLL factor of 4.
Figure 65 : Input / Output Waveforms
Figure 66 : Float Waveforms
2.4V
0.45V
Test Points
0.2VDD+0.9
0.2VDD-0.1
AC inputs during testing are driven at 2.4V for a logic ‘1’ and 0.4V for a logic ‘0’.
Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’.
Timing
Reference
Points
VLoad +0.1V
VLoad -0.1V
VOH -0.1V
VOL +0.1V
VLoad
VOL
VOH
For timing purposes a port pin is no longer floating when VLOAD changes of ±100mV.
It begins to float when a 100mV change from the loaded VOH/VOL level occurs (IOH/IOL = 20mA).
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