IA186XL Datasheet, PDF (27/75 Pages) InnovASIC, Inc – 16-Bit Microcontroller

IA186XL/IA188XL
16-Bit Microcontrollers
Data Sheet
July 6, 2011
Table 7. IA186XL Pin/Signal Descriptions (Continued)
Signal
dt/r_n
Name
dt/r_n
Pin
PLCC
40
PQFP
37
error_n mcs1_n/error_n 37
40
hlda
hlda
51
25
LQFP
54
58
42
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. 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).
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
int0
45
31
48 interrupt N (N = 0–3). Input. Active High.
int1
int1
44
32
49 ^{These maskable inputs interrupt program flow}
int2
int2/inta0_n
42
35
52 ^{and cause execution to continue at an}
int3
int3/inta1_n
41
36
53
interrupt vector of a specific interrupt type as
follows:
int0: Type 12
int1: Type 13
int2: Type 14
int3: Type 15
inta 0_n int2/inta0_n
42
35
inta 1_n int3/inta1_n
41
36
To allow interrupt expansion, int0 and int1
can be used with the interrupt acknowledge
signals inta0_n and inta1_n (see next table
entries).
52 interrupt acknowledge. Output. Active low.
53 ^{When used with external interrupt controllers.}
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