Echelon I/O Model Reference for Smart Transceivers and Neu Instrukcja Użytkownika Pobierz pdf (Strona 47)

I/O Model Reference 37

Table 14. Byte Output Latency Values for Series 3100 Devices

Symbol Description Typical at 10 MHz

fout

Function call to update 57 μs

ret

Return from function 5 μs

Programming Considerations

For byte input/output, the data type of the return value for io_in( ), and the data

type of the output value for io_out( ), is an unsigned short.

Syntax

IO_0 input byte

io-object-name

;

IO_0 output byte

io-object-name

initial-output-level

];

IO_0

Specifies pin IO_0 as the least significant bit of the byte. Byte input/output

uses pins IO_0 through IO_7. The pin specification denotes the lowest

numbered pin of the set and must be IO_0.

io-object-name

A user-specified name for the I/O object, in the ANSI C format for variable

identifiers.

initial-output-level

A constant expression, in ANSI C format for initializers, used to set the state

of the output pin of the I/O object at initialization. The initial state can be

from 0 to 255. The default is 0.

Usage

unsigned int

input-value

;

unsigned int

output-value

;

input-value

= io_in(

io-object-name

);

io_out(

io-object-name

output-value

);

Byte Input Example

IO_0 input byte ioKeyboard;

unsigned int character;

...

when (reset) {

io_change_init(ioKeyboard);

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 208 209

Komentarze do niniejszej Instrukcji

Brak uwag

Echelon I/O Model Reference for Smart Transceivers and Neu Instrukcja Użytkownika Strona 47

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Sprzęt komputerowy Echelon I/O Model Reference for Smart Transceivers and Neu