T80C251TB データシートの表示（PDF） - Intel
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T80C251TB Datasheet PDF : 36 Pages
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8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
6.2 Definition of AC Symbols
Table 10. AC Timing Symbol Definitions
Signals
A Address
D Data In
L ALE
Q Data Out
R RD#/PSEN#
W WR#
Conditions
H High
L Low
V Valid
X No Longer Valid
Z Floating
6.3 A.C. Characteristics
Test Conditions: Capacitive load on all pins = 50 pF.
Table 11 lists AC timing parameters for the with no
wait states. External wait states can be added by
extending PSEN#/RD#/WR# and/or by extending
ALE. In the table, Notes 2 and 3 mark parameters
affected by an
ALE wait state, and Notes 4 and 5 mark parameters
affected by a PSEN#/RD#/WR# wait state.
Figure 6 through Figure 8 show the bus cycles with the timing parameters.
Symbol
FOSC
TOSC
TLHLL
TAVLL
TLLAX
TLLAXA
TRLRH
TRLRHA
TWLWH
TWLWHA
Table 11. AC Characteristics (Sheet 1 of 4)
Parameter
XTAL1 Frequency
1/FOSC
@ 16MHz
@ 24MHz
ALE Pulse Width
@ 16MHz
@ 24MHz
Address Valid to ALE Low
@ 16MHz
@ 24MHz
Address Hold after ALE Low
@ 16MHz
@ 24MHz
Address Hold after ALE Low
@ 16MHz
@ 24MHz
RD# or PSEN# Pulse Width
@ 16MHz
@ 24MHz
RD# or PSEN# Pulse Width
@ 16MHz
@ 24MHz
WR# Pulse Width
@ 16MHz
@ 24MHz
WR# Pulse Width
@ 16MHz
@ 24MHz
@ Max FOSC (1)
Min
Max
N/A
N/A
N/A
N/A
55.5
34.7
49.5
28.7
10
10
20
20
115
73.4
93
51.4
115
73.4
93
51.4
FOSC Variable
Min
Max
0
24
62.5
41.7
(0.5+M)
2TOSC-7
(0.5+M)
2TOSC-13
10
20
(1+N)
2TOSC-10
(1+N)
2TOSC-32
(1+N)
2TOSC-10
(1+N)
2TOSC-32
Units
MHz
ns
ns (3)
ns (3)
ns (4)
ns (5)
ns (3,4)
ns (3,5)
ns (3,4)
ns (3,5)
14
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