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 

AC Characteristics - Real-Time Asynchronous Wait State

Definition of Symbols

Table 43. Real-Time Asynchronous Wait Timing Symbol Definitions

Signals

Conditions

S

PSEN#/RD#/WR#

Y

AWAIT#

L

Low

V

Valid

X

No Longer Valid

Timings

Waveforms

Table 44. Real-Time Asynchronous Wait AC Timings; VDD = 2.7 to 5.5 V, TA = -40 to

85°C

Symbol Parameter

Min

Max

Unit

TSLYV PSEN#/RD#/WR# Low to Wait Set-up

TSLYX Wait Hold after PSEN#/RD#/WR# Low

(2N-1)·TOSC + 10

Note: 1. N is the number of wait states added (N≥ 1).

TOSC - 10

ns

ns(1)

Figure 16. Real-time Asynchronous Wait State Timings

RD#/PSEN#/WR#

TSLYV

TSLYX

AWAIT#

AC Characteristics - Serial Port in Shift Register Mode

Definition of Symbols

Table 45. Serial Port Timing Symbol Definitions

Signals

D

Data In

H

Q

Data Out

L

X

Clock

V

X

Conditions

High

Low

Valid

No Longer Valid

52 AT/TSC8x251G2D

4135F–8051–11/06

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