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Table 3-2
PIO Pin Assignments—Alphabetic Listing
Associated Pin
A17
A18
A19
DEN
DRQ0
DRQ1
DT/R
INT2
INT4
MCS0
MCS1
MCS2
MCS3/RFSH
PCS0
PCS1
PCS2
PCS3
PCS5/A1
PCS6/A2
RXD
S6/CLKDIV2
SCLK
SDATA
SDEN0
SDEN1
SRDY
TMRIN0
TMRIN1
TMROUT0
TMROUT1
TXD
UZI
Notes:
1. These pins are used by emulators. (Emulators also use S2–S0 , RES , NMI, CLKOUTA, BHE ,
ALE, AD15–AD0, and A16–A0.
2. These pins revert to normal operation if BHE/ADEN (Am186EM) or RFSH2/ADEN (Am188EM)
is held Low during power-on reset.
3. When used as a PIO, input with pullup option available.
4. When used as a PIO, input with pulldown option available.
3-10
PIO No.
Power-On Reset Status
7
(1)
Normal operation
8
(1)
Normal operation
(1)
9
Normal operation
5
Normal operation
12
Input with pullup
13
Input with pullup
4
Normal operation
31
Input with pullup
30
Input with pullup
14
Input with pullup
15
Input with pullup
24
Input with pullup
25
Input with pullup
16
Input with pullup
17
Input with pullup
18
Input with pullup
19
Input with pullup
3
Input with pullup
2
Input with pullup
28
Input with pullup
(1,2)
29
Input with pullup
20
Input with pullup
21
Input with pullup
22
Input with pulldown
23
Input with pulldown
6
Normal operation
11
Input with pullup
0
Input with pullup
10
Input with pulldown
1
Input with pulldown
27
Input with pullup
(1,2)
26
Input with pullup
System Overview
(3)
(3)
(3)
(3)
(3)
(4)
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