AT89C51SND1C-ROTIL datasheet(24/42 Pages) ATMEL

tên linh kiện	AT89C51SND1C-ROTIL

Giải thích chi tiết về linh kiện	Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface

PDF	42 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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186

4109JS–8051–10/06

AT8xC51SND1C

22.3

AC Characteristics

22.3.1

External Program Bus Cycles

22.3.1.1

Definition of Symbols

Table 150. External Program Bus Cycles Timing Symbol Definitions

22.3.1.2

Timings

Test conditions: capacitive load on all pins= 50 pF.

Table 151. External Program Bus Cycle - Read AC Timings

DD = 2.7 to 3.3 V, TA = -40 to +85°C

Signals

Conditions

Address

High

Instruction In

Low

LALE

Valid

PPSEN

No Longer Valid

ZFloating

Symbol

Parameter

Variable Clock

Standard Mode

Variable Clock

X2 Mode

Unit

Min

Max

Min

Max

CLCL

Clock Period

LHLL

ALE Pulse Width

2·T

CLCL-15

AVLL

Address Valid to ALE Low

CLCL-20

0.5·T

CLCL-20

LLAX

Address hold after ALE Low

CLCL-20

0.5·T

CLCL-20

LLIV

ALE Low to Valid Instruction

4·T

CLCL-35

2·T

CLCL-35

PLPH

PSEN Pulse Width

3·T

CLCL-25

1.5·T

CLCL-25

PLIV

PSEN Low to Valid Instruction

3·T

CLCL-35

1.5·T

CLCL-35

PXIX

Instruction Hold After PSEN High

PXIZ

Instruction Float After PSEN High

CLCL-10

0.5·T

CLCL-10

AVIV

Address Valid to Valid Instruction

5·T

CLCL-35

2.5·T

CLCL-35

PLAZ

PSEN Low to Address Float

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