AT89C51RC2-3CSCM データシートの表示（PDF） - Atmel Corporation

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AT89C51RC2-3CSCM

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

AT89C51RB2/RC2

External Program Memory

Read Cycle

ALE

PSEN

PORT 0 INSTR IN

TLHLL

TLLAX

TAVLL

A0-A7

TLLIV

TLLPL

TPLPH

12 TCLCL

TPLIV

TPLAZ

TPXIX

INSTR IN

TPXAV

TPXIZ

A0-A7

PORT 2

ADDRESS

OR SFR-P2

TAVIV

ADDRESS A8-A15

INSTR IN

ADDRESS A8-A15

External Data Memory

Characteristics

Table 78. Symbol Description

Symbol

TRLRH

TWLWH

TRLDV

TRHDX

TRHDZ

TLLDV

TAVDV

TLLWL

TAVWL

TQVWX

TQVWH

TWHQX

TRLAZ

TWHLH

Parameter

RD Pulse Width

WR Pulse Width

RD to Valid Data In

Data Hold After RD

Data Float After RD

ALE to Valid Data In

Address to Valid Data In

ALE to WR or RD

Address to WR or RD

Data Valid to WR Transition

Data set-up to WR High

Data Hold After WR

RD Low to Address Float

RD or WR High to ALE high

4180E–8051–10/06

113

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