DS80C390 Datasheet, PDF (55/58 Pages) Dallas Semiconductor – Dual CAN High-Speed Microprocessor

DS80C390
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
A
Address
C
Clock
CE Chip Enable
D
Input data
H
Logic level high
L
Logic level low
I
Instruction
P
PSEN
Q Output data
R _{RD signal}
V Valid
W _{WR signal}
X No longer a valid logic level
Z Tristate
POWER CYCLE TIMING CHARACTERISTICS
PARAMETER
SYMBOL TYP MAX
Crystal start-up time
Power-on reset delay
t_CSU
1.8
t_POR
65536
UNITS
ms
t_CLCL
NOTE
1
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 V_IH2 criteria. At 40 MHz, this time is approximately
1.64 ms.
POWER CYCLE TIMING
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