Remote-processing RPC-220 Manual de usuario descargar pdf (Pagina 24)

DIGITAL LINES SECTION 6

Page 6-1

Figure 6-1 CPU Port

DIGITAL LINES SECTION 6

INTRODUCTION

There are 19 digital lines available. All are from the

CPU, have alternate uses, and are available at J3.

Alternate uses include:

LCD display

PWM output

Interrupts

Counting/timing

Serial I/O

Some lines have 3 uses.

When configuring your system, you will have to make

use of lines based on needed functions and availability.

ELECTRICAL CHARACTERISTICS

Digital ports sink and source a limited amount of

current. Each por t is different as shown in the table

below:

Ports Current/condition

P1.0 - P1.5 1.6 milli-amp sink

P1.0 - P1.5 60 micro-amp/source

P1.6 - P1.7 3.0 milli-amp/sink

P3, P4 1.6 milli-amp/sink

P3, P4 60 micro-amp/source

PWM 0,1 3.2 milli-amp/sink

PWM 0,1 400 micro-amp/source

Digital inputs (except P1.6 and P1.7) have a soft pull up

internal to the CPU. For a more robust signal, add a

pull up resistor to the outputs.

Ports P1. 6 and P1.7 ar e open drain output and do not

have internal pull up. To use these as inputs or output,

make sure the device you are connected to has a pull up

resistor. Otherwise, add one.

Refer to the 80C552 data sheet (file) for more

information on each port.

CPU PORT PIN OUT

Table 6-1 below lists the pin out for CPU port J3. Most

of the lines at this port come from the CPU.

J3-

Pin Primary CPU port name

1 P1.0

2 P4.3

3 P1.1

4 From RTC, square wave output

5 P1.2

6 INT0 (P3. 2)

7 P1.3

8 + 5V supply

9 P1.4

10 System Reset

11 P1.5

12 Ground

13 P4.5

14 Ground

15 P1.6

16 P4.4

17 P1.7

18 + 5V supply

19 P3.4

20 PWM 1 output

21 P3.5

22 PWM 0 output

23 INT 1 (P3. 3)

24 P4.6

25 RTC IRQ

26 P4.7

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 46 47

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Remote-processing RPC-220 Manual de usuario Pagina 24

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