AT80251G2D-3CSUM(2006) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT80251G2D-3CSUM
(Rev.:2006)

8/16-bit Microcontroller with Serial Communication Interfaces

Atmel Corporation 

Figure 12. External Bus Cycle: Data Read (Page Mode)

ALE

TLHLL(1)

TLLRL(1) TRLRH(1)

TRHLH2

RD#/PSEN#

TRLAZ

TLHAX(1)

TAVLL(1)

TLLAX

TRLDV(1)

TRHDZ2

TRHDX

P2

A15:8

D7:0

TAVRL(1)

TAVDV1(1)

TAVDV2(1)

Data In

TRHAX

P0/A16/A17

A7:0/A16/A17

Note: 1. The value of this parameter depends on wait states. See Table 39 and Table 40.

Figure 13. External Bus Cycle: Data Write (Page Mode)

ALE

TLHLL(1)

TWLWH(1)

TWHLH

WR#

TLHAX(1)

TAVLL(1) TLLAX

TQVWH

TWHQX

P2

A15:8

TAVWL1(1)

TAVWL2(1)

D7:0

Data Out

TWHAX

P0/A16/A17

A7:0/A16/A17

Note: 1. The value of this parameter depends on wait states. See Table 39 and Table 40.

AC Characteristics - Real-Time Synchronous Wait State

Definition of Symbols

Table 41. Real-Time Synchronous Wait Timing Symbol Definitions

Signals

Conditions

C

WCLK

R

RD#/PSEN#

W

WR#

Y

WAIT#

L

Low

V

Valid

X

No Longer Valid

50 AT/TSC8x251G2D

4135F–8051–11/06

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