hc08sci.asm

HC08通用SCI程序。HC08SCI.ASM

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;                                                                            ;
;      SCI String transfer program w/ <CR> marking end of string.
;       Send a string, which was stored in EPROM and echo an input
;       string from keyboard ( with <CR> marking end of string).
;                                                                            ;
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;                                                                            ;
; File Name: HC08SCI.ASM                      Copyright (c) Motorola 1996     ;
;                                                                            ;
; Current Revision: 1.40                                                     ;
; Current Release Level: ES                                                  ;
; Current Revision Release Date: 01/04/96                                    ;
;                                                                            ;
; Current Release Written By: Bobby Crouch                                   ;
;                             Motorola CSIC Applications - Austin, Texas     ;
;                                                                            ;
; Assembled Under: IASM    Ver. 3.03                                         ;
;                                                                            ;
;
;                                                                            ;
; Full Functional Description of Routine Purpose:                            ;
;               This program has a main loop which checks for a button
;               to be pressed in order to send a string stored in EPROM,
;               "MC68HC708XL36 :", using <CR> as an end of string delimiter.
;               The main loop also checks for a flag (CHAR) to be set which
;               indicates a string has been received and the end of string
;               delimiter <CR> has been received.  After transmission,
;               the program waits for SCI input.  The MCU stores the
;               incoming data in RAM and echoes the input when a <CR>
;               is detected.
;
;               The part uses SCI Receive interrupts and interrupt service
;               routines to read and store the data in a RAM storage location.
;               The ISR also tests each received byte for the end of string
;               delimiter, <CR>.  When <CR> is detected, the ISR sets a flag,
;               'CHAR', which the main loop is checking.  The main loop, upon
;               detecting the set flag, jumps to a subroutine (SCITRANS_SUB)
;               which echoes the received string to the dumb terminal.
;
;               The SCI module operates at 9600 BAUD, 8 bits, parity disabled.
;
; Part Family Software Routine Works With: HC08                              ;
;                                                                            ;
; Routine Size (Bytes): 480 (S19 FILE)                                       ;
; Stack Space Used (Bytes):1 (H register)                                    ;
; RAM Used (Bytes): 56                                                       ;
;                                                                            ;
;                                                                            ;
;                                                                            ;
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;                                                                            ;
; Update History:                                                            ;
; Rev:               Author:     Date:        Description of Change:         ;
; ----               -------     -----        ----------------------         ;
; ES 1.00            Crouch      09/01/94     Original Release               ;
; ES 1.10            Chretien    10/07/94     1.In BBSCI4 line right after   ;
;                                               label EXIT changed $0D       ;
;                                               to #$0D                      ;
;                                             2.In BBSCI4 in subroutine      ;
;                                               SCIREC_SVR4 move the label   ;
;                                               LAST from the RTI opcode to  ;
;                                               the PULH opcode right above. ;
;ES 1.20             Crouch     04/06/95     1. Edited to compile w/ MASM    ;
;                                               ver 4.9                      ;
;                                            2. Changed program name to      ;
;                                               'SCI_CR.ASM' to agree with   ;
;                                               ORCAD schematic.             ;
;ES1.30              Crouch     04/20/95     1. Edited code to conform with  ;
;                                               'Software Coding Standards'  ;
;                                                                            ;
;ES1.40              Crouch     04 Jan 96    1. Edited for  MCUASM 5.1       ;
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;                                                                            ;
; Motorola reserves the right to make changes without further notice to any  ;
; product herein to improve reliability, function, or design. Motorola does  ;
; not assume any liability arising out of the application or use of any      ;
; product, circuit, or software described herein; neither does it convey any ;
; license under its patent rights nor the rights of others. Motorola         ;
; products are not designed, intended, or authorized for use as components   ;
; in systems intended for surgical implant into the body, or other           ;
; applications intended to support life, or for any other application in     ;
; which the failure of the Motorola product could create a situation where   ;
; personal injury or death may occur. Should Buyer purchase or use Motorola  ;
; products for any such intended or unauthorized application, Buyer shall    ;
; indemnify and hold Motorola and its officers, employees, subsidiaries,     ;
; affiliates, and distributors harmless against all claims, costs, damages,  ;
; and expenses, and reasonable attorney fees arising out of, directly or     ;
; indirectly, any claim of personal injury or death associated with such     ;
; unintended or unauthorized use, even if such claim alleges that Motorola   ;
; was negligent regarding the design or manufacture of the part. Motorola    ;
; and the Motorola Logo are registered trademarks of Motorola Inc.           ;
;                                                                            ;
;                                                                            ;
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;                                                                            ;
;                   Part Specific Framework Includes Section                 ;
;                                                                            ;
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        INCLUDE "H708XL36.FRK"

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;                                                                            ;
;                      RAM Definitions for Main Routine                      ;
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        org     RAM                     ; Start of XL38 RAM.

CHAR:   ds      1                       ; Variable CHAR.
TIME:   ds      1                       ; Variable TIME.
TEMP:   ds      2                       ; Variable TEMP.
COUNT:  ds      1                       ; Variable COUNT.
REC:    ds      50                      ; Received string storage location.



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;                                                                            ;
;                        Program Initialization                              ;
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        org     EPROM                   ; Start of HC708XL36 EPROM ($6E00).

START:  mov     #$03,SCBR               ; 9600 Baud.
        mov     #$40,SCC1               ; 8 Bits, SCI enabled.
        mov     #$2C,SCC2               ; Transmit enabled, receive
                                        ;  -enabled, both IRQs enabled.
        mov     #$00,COUNT              ; Clear variable COUNT.
        mov     #$00,CHAR               ; Clear variable CHAR.
        mov     #$FF,DDRA               ; Set Ports A,C,D,E,F
        mov     #$FE,DDRB               ;  -to all outputs and
        mov     #$FF,DDRC               ;  -set Port B to all outputs
        mov     #$FF,DDRD               ;  -except for PTB0, input.
        mov     #$FF,DDRE               ;
        mov     #$FF,DDRF               ;

        cli                             ; Enable interrupts.