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