P87C151SA datasheet(16/33 Pages) INTEL

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8XC151SASB HIGH-PERFORMANCE CHMOS MICROCONTROLLER

AC Characteristics

Table

lists

timing

parameters

for

the

8XC151SASB with no wait states External wait

states can be added by extending PSEN

andor by extending ALE In the table Notes

3 and 5 mark parameters affected by an ALE wait

state and Notes 4 and 5 mark parameters affected

by a PSEN

wait state

Figures 5 – 11 show the bus cycles with the timing

parameters

Table 9 AC Characteristics (Capacitive Loading e 50 pF)

Symbol

Parameter

Max FOSC (1)

FOSC Variable

Units

Min

Max

Min

Max

FOSC

XTAL1 Frequency

MHz

TOSC

1FOSC

12 MHz

833

16 MHz

625

TLHLL

ALE Pulse Width

12 MHz

683

(3)

16 MHz

475

(1a2M)

TOSC b 15

TAVLL

Address Valid to ALE Low

12 MHz

583

(3)

16 MHz

375

(1a2M)

TOSC b 25

TLLAX

Address Hold after ALE Low

12 MHz

16 MHz

TRLRH (2)

or PSEN

Pulse Width

12 MHz

1516

(4)

16 MHz

110

2(1aN)

TOSC b 15

TWLWH

Pulse Width

12 MHz

1516

(4)

16 MHz

110

2(1aN)

TOSC b 15

TLLRL (2)

ALE Low to RD

or PSEN

Low

12 MHz

583

16 MHz

375

Tosc b 25

TLHAX

ALE High to Address Hold

12 MHz

833

(3)

16 MHz

625

(1a2M)

TOSC

NOTES

1 16 MHz

2 Specifications for PSEN

are identical to those for RD

3 In the formula MeNumber of wait states (0 or 1) for ALE

4 In the formula NeNumber of wait states (0 1 2 or 3) for RD

PSEN

5 ‘‘Typical’’ specifications are untested and not guaranteed

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