COM20051 Datasheet, PDF (74/82 Pages) List of Unclassifed Manufacturers – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

TIMING DIAGRAMS
AC CHARACTERISTICS (0°C - 70°C, 5.0V ± 10%)
100 pF Loading for ALE, PORT0, and nPSEN; 16 MHz Processor Clock
ALE
nPSEN
PORT 0
t7
t1
t8
t3
t10
t2
t5
t4
t9
t6
A0 - A7
t11
INSTR. IN
PORT 2
A8 - A15
Parameter
t1
ALE Pulse Width
t2
Address Valid to ALE Low
t3
ALE Low to nPSEN Low
t4
nPSEN Low to Valid Instruction Input
t5
nPSEN Low to Address Float
t6
Address to Valid Instruction Input
t7
Address Hold after ALE
t8
ALE Low to Valid Instruction Input
t9
nPSEN Pulse Width
t10 Input Instruction Hold after nPSEN
t11 Input Instruction Float after nPSEN
min
typ max units
85
7
22.6
27
142.5
0
nS
nS
nS
82.5 nS
10
nS
207.5 nS
nS
150
nS
nS
nS
37.5 nS
FIGURE 24 – EXTERNAL PROGRAM MEMORY READ CYCLE
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