AMD Am186TMER ユーザーズマニュアル
Programmable I/O Pins
13-2
Table 13-1
PIO Pin Assignments and Register Bits
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) or RFSH2/ADEN (Am188ER)
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.
Register Bit
Associated Pin
Power-On Reset Status
“0” Registers (PIOMODE0, 70h; PDIR0, 72h; PDATA0, 74h)
0
0
TMRIN1
Input with pullup
1
1
TMROUT1
Input with pulldown
2
2
PCS6/A2
Input with pullup
3
3
PCS5/A1
Input with pullup
4
4
DT/R
Normal operation
(3
)
5
5
DEN
Normal operation
(3
)
6
6
SRDY
Normal operation
(4
)
7
(1)
7
A17
Normal operation
(3)
8
(1)
8
A18
Normal operation
(3)
9
(1)
9
A19
Normal operation
(3)
10
10
TMROUT0
Input with pulldown
11
11
TMRIN0
Input with pullup
12
12
DRQ0
Input with pullup
13
13
DRQ1
Input with pullup
14
14
MCS0
Input with pullup
15
15
MCS1
Input with pullup
“1” Registers (PIOMODE1, 76h; PDIR0, 78h; PDATA0, 7Ah)
16
0
PCS0
Input with pullup
17
1
PCS1
Input with pullup
18
2
PCS2
Input with pullup
19
3
PCS3
Input with pullup
20
4
SCLK
Input with pullup
21
5
SDATA
Input with pullup
22
6
SDEN0
Input with pulldown
23
7
SDEN1
Input with pulldown
24
8
MCS2
Input with pullup
25
9
MCS3/RFSH
Input with pullup
26
(1,2)
10
UZI/CLKSEL2
Input with pullup
27
11
TXD
Input with pullup
28
12
RXD
Input with pullup
29
(1,2)
13
S6/CLKSEL1
Input with pullup
30
14
INT4
Input with pullup
31
15
INT2
Input with pullup