COP8CCR9IMT7SLASHNOPB datasheet(18/111 Pages) TI1

18 / 111 page

COP8CBR9, COP8CCR9, COP8CDR9

SNOS535I – OCTOBER 2000 – REVISED MARCH 2013

www.ti.com

DATA

CONFIGURATION Register

Port Set-Up

Hi-Z Input

(TRI-STATE Output)

Input with Weak Pull-Up

Push-Pull Zero Output

Push-Pull One Output

Port A is an 8-bit I/O port. All A pins have Schmitt triggers on the inputs. The 44-pin package does not

have a full 8-bit port and contains some unbonded, floating pads internally on the chip. The binary value

read from these bits is undetermined. The application software should mask out these unknown bits when

reading the Port A register, or use only bit-access program instructions when accessing Port A. These

unconnected bits draw power only when they are addressed (i.e., in brief spikes). Additionally, if Port A is

being used with some combination of digital inputs and analog inputs, the analog inputs will read as

undetermined values and should be masked out by software.

Port A supports the analog inputs for the A/D converter. Port A has the following alternate pin functions:

Analog Channel 7

Analog Channel 6

Analog Channel 5

Analog Channel 4

Analog Channel 3

Analog Channel 2

Analog Channel 1

Analog Channel 0

Port B is an 8-bit I/O port. All B pins have Schmitt triggers on the inputs. If Port B is being used with some

combination of digital inputs and analog inputs, the analog inputs will read as undetermined values. The

application software should mask out these unknown bits when reading the Port B register, or use only bit-

access program instructions when accessing Port B.

Port B supports the analog inputs for the A/D converter. Port B has the following alternate pin functions:

Analog Channel 15 or A/D Input

Analog Channel 14 or Analog Multiplexor Output

Analog Channel 13 or Analog Multiplexor Output

Analog Channel 12

Analog Channel 11

Analog Channel 10

Analog Channel 9

Analog Channel 8

Port C is an 8-bit I/O port. The 44-pin device does not offer Port C. The unavailable pins are not

terminated. A read operation on these unterminated pins will return unpredictable values. On this device,

the associated Port C Data and Configuration registers should not be used. All C pins have Schmitt

triggers on the inputs. Port C draws no power when unbonded.

Pin Descriptions

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Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9

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