RCM2000 datasheet(42/80 Pages) DIGI

42 / 80 page

RabbitCore RCM2000

5.2 I/O

The RCM2000 was designed to interface with other systems, and so there are no drivers

written specifically for this purpose. The general Dynamic C read and write functions

allow you to customize the parallel I/O to meet your specific needs. For example, use

WrPortI(PEDDR, &PEDDRShadow, 0x00);

to set all the port E bits as inputs, or use

WrPortI(PEDDR, &PEDDRShadow, 0xFF);

to set all the port E bits as outputs.

The sample programs in the Dynamic C SAMPLES directory provide further examples.

5.2.1 PCLK Output

The PCLK output is controlled by bits 7 and 6 of the Global Output Register (GOCR) on

the Rabbit 2000 microprocessor, and so can be enabled or disabled in software. Starting

with Dynamic C v 7.02, the PCLK output is disabled by default at compile time to mini-

mize radiated emissions; the PCLK output is enabled in earlier versions of Dynamic C.

Use the following code to set the PCLK output as needed.

PCLK output driven with peripheral clock:

WrPortI(GOCR, &GOCRShadow, (GOCRShadow&~0xc0));

PCLK output driven with peripheral clock ÷ 2:

WrPortI(GOCR, &GOCRShadow, ((GOCRShadow&~0xc0)| 0x40));

PCLK output off (low):

WrPortI(GOCR, &GOCRShadow, ((GOCRShadow&~0xc0)| 0x80));

PCLK output on (high):

WrPortI(GOCR, &GOCRShadow, (GOCRShadow | 0xc0));

RCM2000 bảng dữ liệu(PDF) 42 Page - Digi International Inc.