ia186eb Innovasic Semiconductor Inc., ia186eb Datasheet - Page 36

• 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)
inta1_n
once_n
oscout
lock_n
Signal
lcs_n
nmi
int3/inta1_n
a19/once_n
lock_n
oscout
Name
lcs_n
nmi
®
PLCC
34
29
15
17
83
40
Pin
PQFP
22
17
69
27
4
5
UNCONTROLLED WHEN PRINTED OR COPIED
LQFP
65
60
47
48
32
70
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IA211080314-02
interrupt acknowledge 1. Input/Output. Active
Low. This pin provides an interrupt
acknowledge handshake in response to an
interrupt request on the int1 pin (see previous
table entry).
lower chip select. Input/Output. Active Low.
This pin provides a chip select signal that will be
asserted (low) whenever the address of a
memory bus cycle is within the address space
programmed for that output.
lock. Output. Active Low. When asserted
(low), this signal indicates that the bus cycle in
progress is cannot be interrupted. While
lock_n is active, the IA188EB will not service
bus requests such as HOLD.
When resin_n is active, this pin is weakly held
high and must not be driven low.
non-maskable interrupt. Input. Active High.
When the nmi signal is asserted (high), it
causes a Type 2 interrupt to be serviced by the
IA188EB.
Note: The assertion of nmi is latched internally
by the IA188EB.
on-circuit emulation. Input. Active Low. Note:
ONCE Mode is used for device testing.
If the once_n pin is driven low during a reset
operation, all IA188EB output and input/output
pins are placed in a high-impedance state.
This pin is weakly held high while resin_n is
active.
oscillator output. Output. The oscout pin is
the output connection for an external crystal
that drives the IA188EB internal Pierce
oscillator. (When an external crystal is used, it
is connected between this pin and the clkin
pin—see clkin table entry.)
Note: If an external oscillator or clock source is
used to drive the IA188EB instead of a crystal,
oscout must be left unconnected (i.e., must be
floated). When the IA188EB is operating in the
ONCE mode, oscout does not float.
Description
http://www.Innovasic.com
January 14, 2009
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Data Sheet
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