参数资料
型号: DS80C390-QNR
厂商: DALLAS SEMICONDUCTOR
元件分类: Microcontroller
英文描述: 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 51/58页
文件大小: 5486K
代理商: DS80C390-QNR
DS80C390
55 of 58
110199
EXPLANATION OF AC SYMBOLS
This microcontroller uses timing parameters and symbols similar to the original 8051 family.
The
following list of timing symbols is provided as an aid to understanding the timing diagrams.
t
Time
P
PSEN
A
Address
Q
Output data
C
Clock
R
RD
signal
CE
Chip Enable
V
Valid
D
Input data
W
WR
signal
H
Logic level high
X
No longer a valid logic level
L
Logic level low
Z
Tristate
I
Instruction
POWER CYCLE TIMING CHARACTERISTICS
PARAMETER
SYMBOL
TYP
MAX
UNITS
NOTE
Crystal start-up time
tCSU
1.8
ms
1
Power-on reset delay
tPOR
65536
tCLCL
2
NOTES FOR POWER CYCLE TIMING CHARACTERISTICS
1. Start-up time for crystals varies with load capacitance and manufacturer.
Time shown is for an
11.0592 MHz crystal manufactured by Fox Electronics.
2. Reset delay is a synchronous counter of crystal oscillations during crystal start-up. Counting begins
when the level on the XTAL1 input meets the VIH2 criteria. At 40 MHz, this time is approximately
1.64 ms.
POWER CYCLE TIMING
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