IA186XL/IA188XL
16-Bit Microcontrollers
Data Sheet
July 6, 2011
Table 7. IA186XL Pin/Signal Descriptions (Continued)
Pin
Signal
dt/r_n
Name
dt/r_n
PLCC
40
PQFP
37
LQFP
54
Description
data transmit/receive. Output. This signal is
used to control the direction of data flow for
bidirectional buffers in a buffered system.
When dt/r_n is high, the direction indicated is
transmit; when dt/r_n is low, the direction
indicated is receive.
error_n
hlda
mcs1_n/error_n 37
40
25
58
42
error. Input. Active Low. When this signal is
asserted (low), it indicates that the last
numerics coprocessor operation resulted in an
exception condition.
hold acknowledge. Output. Active High.
When hlda is asserted (high), it indicates that
the IA186XL has relinquished control of the
local bus to another bus master in response to
a HOLD request (see next table entry).
hlda
51
When hlda is asserted, the IA186XL data bus
and control signals are floated allowing
another bus master to drive the signals
directly.
hold
hold
50
26
43
hold. Input. Active High. This signal is a
request indicating that an external bus master
wishes to gain control of the local bus. The
IA186XL will relinquish control of the local bus
between instruction boundaries not
conditioned by a LOCK prefix.
int0
int1
int2
int3
int0
int1
int2/inta0_n
int3/inta1_n
45
44
42
41
31
32
35
36
48
49
52
53
interrupt N (N = 0–3). Input. Active High.
These maskable inputs interrupt program flow
and cause execution to continue at an
interrupt vector of a specific interrupt type as
follows:
int0: Type 12
int1: Type 13
int2: Type 14
int3: Type 15
To allow interrupt expansion, int0 and int1
can be used with the interrupt acknowledge
signals inta0_n and inta1_n (see next table
entries).
inta 0_n
inta 1_n
int2/inta0_n
int3/inta1_n
42
41
35
36
52
53
interrupt acknowledge. Output. Active low.
When used with external interrupt controllers.
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