W79E548 Datasheet, PDF (67/79 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E548/W79L548
18.3 A.C. Characteristics
Clock
tCHCL
tCLCH
tCLCX
tCLCL
tCHCX
Note: Duty cycle is 50%.
External Clock Characteristics
PARAMETER
Clock High Time
Clock Low Time
Clock Rise Time
Clock Fall Time
SYMBOL
t_CHCX
t_CLCX
t_CLCH
t_CHCL
MIN.
12
12
-
-
TYP.
-
-
-
-
MAX.
-
-
10
10
UNITS
nS
nS
nS
nS
18.3.1 A.C. Specification
PARAMETER
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold After ALE Low
Address Hold After ALE Low for
MOVX Write
ALE Low to Valid Instruction In
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid Instruction
In
Input Instruction Hold After
PSEN
Input Instruction Float After
PSEN
Port 0 Address to Valid Instr. In
Port 2 Address to Valid Instr. In
PSEN Low to Address Float
Data Hold After Read
Data Float After Read
RD Low to Address Float
SYMBOL
1/t_CLCL
t_LHLL
t_AVLL
t_LLAX1
t_LLAX2
t_LLIV
t_LLPL
t_PLPH
t_PLIV
t_PXIX
t_PXIZ
t_AVIV1
t_AVIV2
t_PLAZ
t_RHDX
t_RHDZ
t_RLAZ
VARIABLE
CLOCK MIN.
0
1.5t_CLCL - 5
0.5t_CLCL - 5
0.5t_CLCL - 5
0.5t_CLCL - 5
0.5t_CLCL - 5
2.0t_CLCL - 5
0
0
0
VARIABLE
CLOCK MAX.
40
2.5t_CLCL - 20
2.0t_CLCL - 20
t_CLCL - 5
3.0t_CLCL - 20
3.5t_CLCL - 20
t_CLCL - 5
0.5t_CLCL - 5
NOTES
UNITS
MHz
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
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Publication Release Date: December 12, 2005
Revision A1