IA186XL/IA188XL
16-Bit Microcontrollers
Data Sheet
July 6, 2011
Table 8. IA188XL Pin/Signal Descriptions (Continued)
Pin
Signal
tmr out 0
Name
tmr out 0
PLCC
22
PQFP
57
LQFP
75
Description
timer 0 output. Output. Depending on the
Timer Mode programmed for Timer 0, this
output can provide a single pulse or a
repetitive waveform.
tmr out 1
ucs_n
tmr out 1
ucs_n
23
34
56
45
74
62
timer 1 output. Output. Depending on the
Timer Mode programmed for Timer 1, this
output can provide a single pulse or a
repetitive waveform.
upper chip select. 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.
vcc
vss
vcc
vss
9, 43
33, 34,
72, 73
10, 11, Power (VCC). This pin provides power for the
20, 50, IA188XL device. It must be connected to a
51, 61 +5V DC power source.
30, 31, Ground (VSS). This pin provides the digital
41, 70, ground (0V) for the IA186XL. It must be
26,
60
12, 13,
53
80
connected to a VSS board plane.
wr_n
wr_n/qs1
63
8
27
write. Output. Active Low. When asserted
(low), wr_n indicates that data available on
the data bus are to be latched into the
accessed memory or I/O device.
x1
x2
x1
x2
59
58
16
17
32
33
x1 and x2 are inputs for the crystal
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