COP8CDR9KMT7 datasheet(18/84 Pages) NSC

18 / 84 page

9.0 Pin Descriptions

The COP8CBR/CCR/CDR I/O structure enables designers

to reconfigure the microcontroller’s I/O functions with a

single instruction. Each individual I/O pin can be indepen-

dently configured as output pin low, output high, input with

high impedance or input with weak pull-up device. A typical

example is the use of I/O pins as the keyboard matrix input

lines. The input lines can be programmed with internal weak

pull-ups so that the input lines read logic high when the keys

are all open. With a key closure, the corresponding input line

will read a logic zero since the weak pull-up can easily be

overdriven. When the key is released, the internal weak

pull-up will pull the input line back to logic high. This elimi-

nates the need for external pull-up resistors. The high cur-

rent options are available for driving LEDs, motors and

speakers. This flexibility helps to ensure a cleaner design,

with less external components and lower costs. Below is the

general description of all available pins.

CC and GND are the power supply pins. All VCC and GND

pins must be connected.

Users of the LLP package are cautioned to be aware that the

central metal area and the pin 1 index mark on the bottom of

the package may be connected to GND. See figure below:

CKI is the clock input. This can be connected (in conjunction

with CKO) to an external crystal circuit to form a crystal

oscillator. See Oscillator Description section.

RESET is the master reset input. See Reset description

section.

CC is the Analog Supply for A/D converter. It should be

connected to V

CC externally. This is also the top of the

resistor ladder D/A converter used within the A/D converter.

AGND is the ground pin for the A/D converter. It should be

connected to GND externally. This is also the bottom of the

resistor ladder D/A converter used within the A/D converter.

The device contains up to six bidirectional 8-bit I/O ports (A,

B, C, E, G and L) and one 4-bit I/O port (F), where each

individual bit may be independently configured as an input

(Schmitt trigger inputs on ports L and G), output or TRI-

STATE under program control. Three data memory address

locations are allocated for each of these I/O ports. Each I/O

port has three associated 8-bit memory mapped registers,

the CONFIGURATION register, the output DATA register and

the Pin input register. (See the memory map for the various

addresses associated with the I/O ports.) Figure 3 shows the

I/O port configurations. The DATA and CONFIGURATION

registers allow for each port bit to be individually configured

under software control as shown below:

CONFIGURATION

DATA

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 uncon-

nected 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:

A7 Analog Channel 7

A6 Analog Channel 6

A5 Analog Channel 5

A4 Analog Channel 4

A3 Analog Channel 3

A2 Analog Channel 2

A1 Analog Channel 1

A0 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

accessing Port B.

Port B supports the analog inputs for the A/D converter. Port

B has the following alternate pin functions:

B7 Analog Channel 15 or A/D Input

B6 Analog Channel 14 or Analog Multiplexor Output

B5 Analog Channel 13 or Analog Multiplexor Output

B4 Analog Channel 12

B3 Analog Channel 11

B2 Analog Channel 10

B1 Analog Channel 9

B0 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 unpredict-

able 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.

Port E is an 8-bit I/O Port. The 44-pin device does not offer

Port E. The unavailable pins are not terminated. A read

operation on these unterminated pins will return unpredict-

able values. On this device, the associated Port E Data and

10137470

FIGURE 2. LLP Package Bottom View

COP8CDR9KMT7 Datasheet(PDF) 18 Page - National Semiconductor (TI)

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