ia186eb Innovasic Semiconductor Inc., ia186eb Datasheet - Page 38

• Manufacturer Part Number: ia186eb
• Description: 8-bit/16-bit Microcontrollers
• Manufacturer: Innovasic Semiconductor Inc.

IA186EB/IA188EB
8-Bit/16-Bit Microcontrollers
Table 8. IA188EB Pin/Signal Descriptions (Continued)
resin_n
Signal
resout
rfsh_n
pdtmr
ready
rd_n
resin_n
resout
rfsh_n
Name
pdtmr
ready
rd_n
®
PLCC
36
18
37
38
4
7
Pin
PQFP
24
73
25
26
76
6
UNCONTROLLED WHEN PRINTED OR COPIED
LQFP
67
36
49
68
69
39
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IA211080314-02
Power-down timer. Input/Output (push-pull).
Note: The IA188EB enters Powerdown Mode
when the PWRDN bit in the Power Control
Register is set to 1 and a HALT instruction is
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).
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. 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 being used, in which case,
ready is ignored.
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.
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).
refresh. Output. Active Low. When rfsh_n is
asserted (low), it indicates that a refresh cycle is
in progress.
Description
http://www.Innovasic.com
January 14, 2009
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