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3-10
Table 3-1 PIO Pin Assignments—Numeric Listing
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 (Am186ER microcontroller) or RFSH2/ADEN
(Am188ER microcontroller) 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.
PIO No. Associated Pin Power-On Reset Status
0 TMRIN1 Input with pullup
1 TMROUT1 Input with pulldown
2PCS
6/A2 Input with pullup
3PCS
5/A1 Input with pullup
4
DT/R
Normal operation
(3)
5
DEN
Normal operation
(3)
6
SRDY
Normal operation
(4)
7
(1)
A17
Normal operation
(3)
8
(1)
A18
Normal operation
(3)
9
(1)
A19
Normal operation
(3)
10 TMROUT0 Input with pulldown
11 TMRIN0 Input with pullup
12 DRQ0 Input with pullup
13 DRQ1 Input with pullup
14 MCS
0 Input with pullup
15 MCS
1 Input with pullup
16 PCS
0 Input with pullup
17 PCS
1 Input with pullup
18 PCS
2 Input with pullup
19 PCS
3 Input with pullup
20 SCLK Input with pullup
21 SDATA Input with pullup
22 SDEN0 Input with pulldown
23 SDEN1 Input with pulldown
24 MCS
2 Input with pullup
25 MCS
3/RFSH Input with pullup
26
(1,2)
UZI/CLKSEL2 Input with pullup
27 TXD Input with pullup
28 RXD Input with pullup
29
(1,2)
S6/CLKSEL1 Input with pullup
30 INT4 Input with pullup
31 INT2 Input with pullup