Intel 80C196NU User Manual

B-13

SIGNAL DESCRIPTIONS

B.3

DEFAULT CONDITIONS

Table B-5 lists the default functions of the I/O and control pins of the 8XC196NP and 80C196NU
with their values during various operating conditions. Table B-4 defines the symbols used to rep-
resent the pin status. Refer to the DC Characteristics table in the datasheet for actual specifica-
tions for V

, V

, and V

Table B-4. Definition of Status Symbols

Symbol

Definition

Symbol

Definition

Voltage less than or equal to V

, V

MD0

Medium pull-down

Voltage greater than or equal to V

, V

MD1

Medium pull-up

HiZ

High impedance

WK0

Weak pull-down

LoZ0

Low impedance; strongly driven low

WK1

Weak pull-up

LoZ1

Low impedance; strongly driven high

ODIO

Open-drain I/O

Table B-5. 8XC196NP and 80C196NU Pin Status

Port Pins

Multiplexed

With

During

RESET#

Active

Upon

RESET#

Inactive

(Note 11)

Idle

Power-

down

(NP/NU)

and

Standby

(NU only)

Hold

Bus

Idle

P1.3:0

EPA3:0

WK1

(Note 1)

—

P1.4

T1CLK

WK1

(Note 1)

—

P1.5

T1DIR

WK1

(Note 1)

—

P1.6

T2CLK

WK1

(Note 1)

—

P1.7

T2DIR

WK1

(Note 1)

—

P2.0

TXD

WK1

(Note 1)

—

P2.1

RXD

WK1

(Note 1)

—

P2.2

EXTINT0

WK1

(Note 1)

—

P2.3

BREQ#

WK1

(Note 1)

—

P2.4

EXTINT1

WK1

(Note 1)

—

P2.5

HOLD#

WK1

(Note 1)

Force 0

—

P2.6

HLDA#

WK1

(Note 1)

—

P2.7

CLKOUT

active;

LoZ0/1

CLKOUT

active;

LoZ0/1

(Note 1)

(Note 2)

(Note 1)

—

P3.0

CS0#

WK1

1 (NP only)
0 (NU only)

(Note 3)

(Note 4)

—

P3.5:1

CS5:1#

WK1

(Note 3)

(Note 4)

—

P3.6

EXTINT2

WK1

(Note 1)

—

P3.7

EXTINT3

WK1

(Note 1)

—

P4.2:0

PWM2:0

WK1

(Note 1)

—