At83c26 – Rainbow Electronics AT83C26 User Manual
Page 55
55
7511B–SCR–10/05
AT83C26
Reset value = 0x XXXX 1000
Reset value for IOSEL[3:0]= 0x1000
Table 37. IO_SELECT (Selection byte for IO)
7
6
5
4
3
2
1
0
X
X
X
X
IOSEL3
IOSEL2
IOSEL1
IOSEL0
Bit Number
Bit Mnemonic
Description
7
X
6
X
5
X
4
X
3-0
IOSEL[3:0]
IO Selection
This field indicates the IO routing between the host and the Smart Card Interfaces when activated,
seeTable 38 and IODISn value (n=1, 2, 3, 4, 5). When no host IO is routed to a smart card pin, this pin is
driven according to the Interface register. See Section “CIO, CC4, CC8 controller”, page 15.
Table 38. IO Selection
IOSEL[3:0]
IO1
IO2
AUX1
AUX2
0000
CIO1
-
(1)
-
(1)
-
(1)
0001
CIO2
-
(1)
-
(1)
-
(1)
-
0010
CIO3
-
(1)
-
(1)
-
(1)
0011
CIO4
-
(1)
-
(1)
-
(1)
0100
CIO5
-
(1)
-
(1)
-
(1)
0101
CIO1
CIO2
CC41
CIO3/CC42
0110
CIO1
CIO2
CC41
CIO4
0111
CIO1
CIO2
CC41
CIO5
1000
CIO1
CIO2
CC41
CC81
1001
CIO1
CIO3
CC41
CC81
1010
CIO1
CIO4
CC41
CC81
1011
CIO1
CIO5
CC41
CC81
1100
CIO1
CIO5
CIO3/CC42
CIO4
1101
CIO2
CIO5
CIO3/CC42
CIO4
1110
CIO2
CIO4
CIO3/CC42
CRST3/CC82
1111
CIO2
CIO5
CIO3/CC42
CRST3/CC82