Rainbow-electronics AT83C26 Manual de usuario descargar pdf (Pagina 16)

7511B–SCR–10/05

AT83C26

CIO2, CC42, CC82 controller for SC2 interface

Figure 8. CIO2, CC42, CC82 Block Diagram

The SC2_FULL bit must be set to use CC42 and CC82.

CIOn controller for SCn interface (n=3, 4, 5)

The CIOn output pin is driven by CARDIOn bit values or by I/O1, I/O2, AUX1 or AUX2 signals.

This selection depends of the IODISn bit value. If IODISn is reset, data are bidirectional between

the I/O1, I/O2, AUX1, AUX2 pins (see IO_SELECT register) and CIOn pins.

Figure 9. CIOn Block Diagram

CIOn (n=1 to 5), CC41, CC81, CC42, CC82 transparent mode description

Two modes are available on CIOn, CC4n, CC8n signals:

• Bit control (a bit controls the output pin)

• Transparent mode (IO signal and CIO are linked after level shifter)

According to IO_SELECT register value and IODISn bits values, one of 4 input pins (IO1, IO2,

AUX1 or AUX2) is linked to the selected output.

The idle state is the high level. Each signal is bidirectional.

CIO2

CARDIO2 bit

CC4

CC82

CARDC82 bit

CARDC42 bit

IO1

IO2

AUX2

AUX1

HiZ

control

Multiplex

IODIS2 bit

IOSEL[3:0]

CIOn

CARDIOn bit

IODISn bit

IO1

IO2

AUX2

AUX1

IOSEL[3:0]

HiZ

control

Multiplex

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 76 77

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Rainbow-electronics AT83C26 Manual de usuario Pagina 16

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