IA186EB/IA188EB
Data Sheet
8-Bit/16-Bit Microcontrollers
July 10, 2011
2.3
IA188EB Pin/Signal Descriptions
Descriptions of the pin and signal functions for the IA188EB microcontroller are provided in
Table 8.
Several of the IA188EB pins have different functions depending on the operating mode of the
device. Each of the different signals supported by a pin is listed and defined in Table 8—
indexed alphabetically in the first column of the table. Additionally, the name of the pin
associated with the signal as well as the pin numbers for the PLCC, LQFP, and LQFP packages
are provided in the ―Pin‖ column.
Table 8. IA188EB Pin/Signal Descriptions
Pin
Signal
a8
a9
Name
a8
a9
a10
a11
a12
a13
a14
a15
PLCC
62
67
69
71
73
75
77
79
80
81
82
83
61
66
68
70
72
74
76
78
6
LQFP
48
53
55
57
59
61
63
65
66
67
68
69
47
52
54
56
58
60
62
64
75
PQFP
11
16
18
20
22
24
26
28
29
30
31
32
10
15
17
19
21
23
25
27
38
Description
address Bits [8-19]. Output. These pins
provide the 12 most-significant bits of the
Address Bus. During the entire IA188EB bus
cycle, Address Bits [8–19] are presented on the
bus and can be latched using the ale signal
(see table entry).
a10
a11
a12
a13
a14
a15
a16
a17
a18
a19
ad0
ad1
ad2
ad3
ad4
ad5
ad6
ad7
ale
a16
a17
a18
a19/once_n
ad0
address/data Bits [0–7]. Input/Output. These
pins provide a multiplexed Address Bus and
Data Bus. During the address portion of the
IA188EB bus cycle, Address Bits [0–7] are
presented on the bus and can be latched using
the ale signal (see next table entry). During the
data portion of the IA188EB bus cycle, 8-bit
data are present on these lines.
ad1
ad2
ad3
ad4
ad5
ad6
ad7
ale
address latch enable. Output. Active High.
This signal is used to latch the address
information during the address portion of a bus
cycle.
bclk0
p2.5/bclk0
54
41
4
baud clock, Serial Port 0. Input. The bclk0 pin
can be used to provide an alternate clock
source for Serial Port 0. The input clock rate
cannot be greater than one-half the operating
frequency of the IA188EB.
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