COP888CL datasheet(13/42 Pages) TI1

13 / 42 page

Typical Performance Characteristics −40˚C ≤ T

A ≤ +85˚C unless otherwise specified (Continued)

Pin Descriptions

CC and GND are the power supply pins.

CKI is the clock input. This can come from an R/C generated

oscillator, or a crystal oscillator (in conjunction with CKO).

See Oscillator Description section.

RESET is the master reset input. See Reset Description

section.

The device contains three bidirectional 8-bit I/O ports (C, G

and L), where each individual bit may be independently

configured as an input (Schmitt trigger inputs on ports G and

L), 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 two associated 8-bit memory

mapped registers, the CONFIGURATION register and the

output DATA register. A memory mapped address is also

reserved for the input pins of each I/O port. (See the memory

map for the various addresses associated with the I/O ports.)

Figure 4 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 be-

low:

CONFIGURA-

TION

DATA

Port Set-Up

Hi-Z Input

(TRI-STATE Output)

Input with Weak Pull-Up

Push-Pull Zero Output

Push-Pull One Output

Port L/C/G Push-Pull Source Current

DS009766-31

Port L/C/G Push-Pull Sink Current

DS009766-32

Port D Source Current

DS009766-33

Port D Sink Current

DS009766-34

DS009766-6

FIGURE 4. I/O Port Configurations

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