80C188EC13 datasheet(14/57 Pages) INTEL

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80C186EC188EC 80L186EC188EC

Table 2 Pin Descriptions

(Continued)

Pin Name

Input

Output

Pin Description

Type

States

P31TXI1

H(X)H(Q)

Transmit Interrupt

output goes active to indicate that

serial channel 1 has completed a transfer TXI1 is

R(0)

multiplexed with an output only Port function

I(Q)

P(X)

P30RXI1

H(X)H(Q)

Receive Interrupt

output goes active to indicate that

serial channel 1 has completed a reception RXI1 is

R(0)

multiplexed with an output only port function

I(Q)

P(X)

WDTOUT

H(Q)

WatchDog Timer OUTput

is driven low for four clock

cycles when the watchdog timer reaches zero WDTOUT

R(1)

may be ANDed with the power-on reset signal to reset the

I(Q)

processor when the watchdog timer is not properly reset

P(X)

P27CTS1

A(L)

H(X)

Clear-To-Send

input is used to prevent the transmission

of serial data on the TXD signal pin CTS1 and CTS0 are

P23CTS0

R(Z)

multiplexed with an IO Port function

I(X)

P(X)

P26BCLK1

A(L)

H(X)

Baud CLocK

input can be used as an alternate clock

source for each of the integrated serial channels The

P22BCLK0

A(E)

R(Z)

BCLK inputs are multiplexed with IO Port functions The

I(X)

BCLK input frequency cannot exceed

the operating

P(X)

frequency of the processor

P25TXD1

A(L)

H(Q)

Transmit Data

output provides serial data information

The TXD outputs are multiplexed with IO Port functions

P21TXD0

R(Z)

During synchronous serial communications TXD will

I(X)I(Q)

function as a clock output

P(X)

P24RXD1

A(L)

H(X)H(Q)

Receive Data

input accepts serial data information The

RXD pins are multiplexed with IO Port functions During

P20RXD0

R(Z)

synchronous serial communications RXD is bi-directional

I(X)I(Q)

and will become an output for transmission of data (TXD

P(X)

becomes the clock)

DRQ30

A(L)

DMA ReQuest

input pins are used to request a DMA

transfer The timing of the request is dependent on the

programmed synchronization mode

NOTES

1 READY is A(E) for the rising edge of CLKOUT S(E) for the falling edge of CLKOUT

2 Pin names in parentheses apply to the 80C188EC80L188EC

80C188EC13 Datasheet(PDF) 14 Page - Intel Corporation

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