IA186EB datasheet(34/85 Pages) INNOVASIC

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IA186EB/IA188EB

Data Sheet

8-Bit/16-Bit Microcontrollers

July 10, 2011

IA211080314-13

http://www.Innovasic.com

UNCONTROLLED WHEN PRINTED OR COPIED

Customer Support:

Page 34 of 85

1-888-824-4184

2.3

IA188EB Pin/Signal Descriptions

Descriptions of the pin and signal functions for the IA188EB microcontroller are provided in

Table 8.

Several of the IA188EB pins have different functions depending on the operating mode of the

device. Each of the different signals supported by a pin is listed and defined in Table 8—

indexed alphabetically in the first column of the table. Additionally, the name of the pin

associated with the signal as well as the pin numbers for the PLCC, LQFP, and LQFP packages

are provided in the ―Pin‖ column.

Table 8. IA188EB Pin/Signal Descriptions

Signal

Description

Name

PLCC

LQFP

PQFP

address Bits [8-19]. Output. These pins

provide the 12 most-significant bits of the

Address Bus. During the entire IA188EB bus

cycle, Address Bits [8

–19] are presented on the

bus and can be latched using the ale signal

(see table entry).

a10

a11

a12

a13

a14

a15

a16

a17

a18

a19

a19/once_n

ad0

address/data Bits [0

–7]. Input/Output. These

pins provide a multiplexed Address Bus and

Data Bus. During the address portion of the

IA188EB bus cycle, Address Bits [0

–7] are

presented on the bus and can be latched using

the ale signal (see next table entry). During the

data portion of the IA188EB bus cycle, 8-bit

data are present on these lines.

ad1

ad2

ad3

ad4

ad5

ad6

ad7

ale

address latch enable. Output. Active High.

This signal is used to latch the address

information during the address portion of a bus

cycle.

bclk0

p2.5/bclk0

baud clock, Serial Port 0. Input. The bclk0 pin

can be used to provide an alternate clock

source for Serial Port 0. The input clock rate

cannot be greater than one-half the operating

frequency of the IA188EB.

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