PRELIMINARY

19

80296SA COMMERCIAL CHMOS 16-BIT MICROCONTROLLER

6.2.2

EXPLANATION OF AC SYMBOLS

Each AC timing symbol is two pairs of letters prefixed by “T” for time. The characters in a pair indicate a signal

and its condition, respectively. Symbols represent the time between the two signal/condition points.

Table 7. AC Timing Symbol Definitions

Character

Signal(s)

A

AD15:0, A19:0

BBHE#

BR

BREQ#

CCLKOUT

D

AD15:0, AD7:0, RXD (SIO mode 0 input data)

HHOLD#

HA

HLDA#

LALE

Q

AD15:0, AD7:0, RXD (SIO mode 0 output data)

R

RD#

SCS

W

WR#, WRH#,WRL#

X

XTAL1, TXD (SIO clock)

Y

READY

Character

Condition

H

High

L

Low

VValid

X

No Longer Valid

Z

Floating (low impedance)