Rainbow Electronics AT83C26 - 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