80C186EB datasheet(13/59 Pages) INTEL

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80C186EB80C188EB 80L186EB80L188EB

Table 3 Pin Descriptions

(Continued)

Input

Output

Description

Name

Type

States

T0OUT

H(Q)

Timer OUTput

pins can be programmed to provide a

single clock or continuous waveform generation

T1OUT

R(1)

depending on the timer mode selected

P(Q)

T0IN

A(L)

Timer INput

is used either as clock or control signals

depending on the timer mode selected

T1IN

A(E)

INT0

A(EL)

Maskable INTerrupt input will cause a vector to a

specific Type interrupt routine To allow interrupt

INT1

expansion INT0 andor INT1 can be used with

INT4

INTA0 and INTA1 to interface with an external slave

controller

INT2INTA0

A(EL)

H(1)

These pins provide a multiplexed function As inputs

they provide a maskable INTerrupt that will cause

INT3INTA1

R(Z)

the CPU to vector to a specific Type interrupt routine

P(1)

As outputs each is programmatically controlled to

provide an INTERRUPT ACKNOWLEDGE

handshake signal to allow interrupt expansion

P27

A(L)

H(X)

BI-DIRECTIONAL open-drain Port pins

P26

R(Z)

P(X)

CTSO

A(L)

Clear-To-Send

input is used to prevent the

transmission of serial data on their respective TXD

P24CTS1

signal pin CTS1 is multiplexed with an input only port

function

TXD0

H(X)H(Q)

Transmit Data

output provides serial data

information TXD1 is multiplexed with an output only

P21TXD1

R(1)

Port

function During synchronous serial

P(X)P(Q)

communications TXD will function as a clock output

RXD0

A(L)

R(Z)

Receive Data

input accepts serial data information

RXD1 is multiplexed with an input only Port function

P20RXD1

H(Q)

During synchronous serial communications RXD is

P(X)

bi-directional and will become an output for

transmission or data (TXD becomes the clock)

P25BCLK0

A(L)A(E)

Baud CLocK

input can be used as an alternate clock

source for each of the integrated serial channels

P22BCLK1

BCLKx is multiplexed with an input only Port function

and cannot exceed a clock rate greater than one-half

the operating frequency of the processor

P23SINT1

H(X)H(Q)

Serial INTerrupt

output will go active to indicate

serial channel 1 requires service SINT1 is

R(0)

multiplexed with an output only Port function

P(X)P(X)

NOTE

Pin names in parentheses apply to the 80C188EB80L188EB

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