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UPSD325X 数据表(PDF) 147 Page - STMicroelectronics

部件名 UPSD325X
功能描述  Flash Programmable System Devices with 8032 Microcontroller Core and 256Kbit SRAM
PDF  176 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

UPSD325X 数据表(HTML) 147 Page - STMicroelectronics

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µPSD325X DEVICES
Table 111. AC Symbols for Timing
Example: tAVLX – Time from Address Valid to ALE
Invalid.
Figure 74. Switching Waveforms – Key
Signal Letters
Signal Behavior
A
Address
t
Time
C
Clock
L
Logic Level Low or ALE
D
Input Data
H
Logic Level High
I
Instruction
V
Valid
L
ALE
X
No Longer a Valid Logic Level
N
RESET Input or Output
Z
Float
P
PSEN signal
PW
Pulse Width
Q
Output Data
R
RD signal
W
WR signal
B
VSTBY Output
M
Output Macrocell
WAVEFORMS
INPUTS
OUTPUTS
STEADY INPUT
MAY CHANGE FROM
HI TO LO
MAY CHANGE FROM
LO TO HI
DON'T CARE
OUTPUTS ONLY
STEADY OUTPUT
WILL BE CHANGING
FROM HI TO LO
WILL BE CHANGING
LO TO HI
CHANGING, STATE
UNKNOWN
CENTER LINE IS
TRI-STATE
AI03102



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