IA186EB datasheet(39/85 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

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Page 39 of 85

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Table 8. IA188EB Pin/Signal Descriptions (Continued)

Signal

Description

Name

PLCC

LQFP

PQFP

pdtmr

Power-down timer. Input/Output (push-pull).

Note: The IA188EB enters Powerdown Mode

when the PWRDN bit in the Power Control

executed. Exit from the Powerdown Mode

occurs upon receipt of a non-maskable interrupt

(i.e., assertion of the nmi input) or a reset (i.e.,

assertion of the resin_n input).

The pdtmr pin, which is normally connected to

an external capacitor, determines the amount of

time that the IA188EB waits before resuming

normal operation after an exit from the

Powerdown when a non-maskable interrupt is

received

—essentially a delay between the

assertion of the nmi input and the enabling of

the IA188EB internal clocks. The delay

required depends on the start-up characteristics

of the crystal oscillator.

The pdtmr pin does not apply when the

Powerdown Mode is exited by the receipt of a

reset (i.e., the assertion resin_n).

rd_n

read. Output. Active Low. When asserted

(low), rd_n indicates that the accessed memory

or I/O device must drive data from the location

being accessed onto the data bus.

ready

ready. Input. Active High. When asserted

(high) the ready line indicates the completion of

a bus cycle. This signal must be active to

terminate any bus cycle unless the IA188EB

Chip-Select Unit is configured to ignore ready.

resin_n

reset input. Input. Active Low. When resin_n

is asserted (low), the IA188EB immediately

terminates any bus cycle in progress and

assumes an initialized state. All pins are driven

to a known state, and resout (see next table

entry) is asserted.

resout

reset output. Output. Active High. When

resout is asserted, it indicates that the IA188EB

is being reset. The resout signal will remain

active (high) as long as resin_n remains active

(low).

rfsh_n

refresh. Output. Active Low. When rfsh_n is

asserted (low), it indicates that a refresh cycle is

in progress.

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