Motorola USB08 U08232.C

Source Code Files

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USB08 Evaluation Board Designer Reference Manual

MOTOROLA Source Code Files 113

U08232.C

//===================== ======================== ======================= ========

// File: U08232.C

// Func: RS232 Implemen tation Module for USB08 Demo Application

// Ver.: 1.00

// http://hc08web .de/usb08

// Rem.: View/Edit this File with TAB-Size=4

//===================== ======================== ======================= ========

//--------------------- ------------------------ ----------------------- --------

#include "hc08jb8.h" // HC08JB8 Register De finitions

#include "u08232.h" // Header File for RS2 32 Module

//--------------------- ------------------------ ----------------------- --------

// Hardware Dependencie s - Physical Port Usage for Software SCI Tx/Rx

// Change the following Definitions to meet you r Hardware Requirements :

//--------------------- ------------------------ ----------------------- --------

// Transmit Line is PTC[0]

#define setTxLow() (PTC &= ~0x01)

#define setTxHigh() (PTC |= 0x01)

#define enaTxOut() (DDRC |= 0x01)

// Receive Line is PTA[ 7]

#define tstRxLvl() (PTA & 0x80 )

#define enaRxIn() (DDRA &= ~0x80)

//--------------------- ------------------------ ----------------------- --------

// Hardware Dependencie s - SSCI Bit Timing gene rated by System Timer T IM

// Change the following Definitions to meet you r Hardware Requirements :

//--------------------- ------------------------ ----------------------- --------

// clear TSTOP Bit in TSC Register to ac tiv at e Counter

// PS0..PS2 Prescaler B its in TSC Register must be 0 (default)

// so the Counter Rate is 3 MHz (0.333µs )

// 9600 Baud -> 104.1666 us per Bit -> 312. 5 Cl oc ks per Bit @ 3MHz

// 2400 Baud -> 416.6666 us per Bit -> 1250 Cloc ks per Bit @ 3MHz

// Adjust Value depending on Subroutine Call Overhead

//--------------------- ------------------------ ----------------------- --------