Intel 8XC251SA Instrukcja Użytkownika Pobierz pdf (Strona 20)

20 PRELIMINARY

8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

RLRH

(2) RD# or PSEN# Pulse Width

@ 12 MHz

@ 16 MHz

146.6

105

2(1+N)

OSC

– 20

(4)

WLWH

WR# Pulse Width

@ 12 MHz

@ 16 MHz

146.6

105

2(1+N)

OSC

– 20

(4)

LLRL

(2) ALE Low to RD# or PSEN# Low

@ 12 MHz

@ 16 MHz

58.3

37.5 T

OSC

– 25

LHAX

ALE High to Address Hold

@ 12 MHz

@ 16 MHz

83.3

62.5

(1+2M)T

OSC

(3)

RLDV

(2) RD#/PSEN# Low to valid Data/Instruction In

@ 12 MHz

@ 16 MHz

106.6

2(1+N)

Tosc – 60

(4)

RHDX

(2) Data/Instruction Hold Time. Occurs after

RD#/PSEN# are exerted to V

00 ns

RLAZ

(2) RD#/PSEN# Low to Address Float Typ.=0

(5)

2 Typ. = 0

(5)

2ns

RHDZ1

Instruction Float after RD#/PSEN# High

commercial @ 12 MHz and 16 MHz

express @ 12 MHz and 16 MHz

Typ.=2

(5)

Typ.=25

(5)

RHDZ2

Data Float after RD#/PSEN# High

@ 12 MHz

@ 16 MHz

156.6

115

2Tosc – 10

RHLH1

RD#/PSEN# High to ALE High (Instruction)

@ 12 MHz

@ 16 MHz

10 10

RHLH2

RD#/PSEN# High to ALE High (Data)

@ 12 MHz

@ 16 MHz

156.6

115

osc

- 10

WHLH

WR# High to ALE High

@ 12 MHz

@ 16 MHz

171.6

130

osc

+ 5

Table 11. AC Characteristics (Continued)

Symbol Parameter

@ Max F

osc

(1) F

osc

Variable

Units

Min Max Min Max

NOTES:

1. 16 MHz.

2. Specifications for PSEN# are identical to those for RD#.

3. In the formula, M=Number of wait states (0 or 1) for ALE.

4. In the formula, N=Number of wait states (0,1,2, or 3) for RD#/PSEN#/WR#.

5. “Typical” specifications are untested and not guaranteed.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 35 36

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