
Application Note
AN1060 — Rev. 1.0
250
MOTOROLA
 47               * MEMORY CONFIGURATION EQUATES
 48               *
 49 B600          EEPMSTR  EQU    $B600          Start of EEPROM
 50 B7FF          EEPMEND  EQU    $B7FF          End of EEPROM
 51               *
 52 D000          EPRMSTR  EQU    $D000          Start of EPROM
 53 FFFF          EPRMEND  EQU    $FFFF          End of EPROM
 54               *
 55 0000          RAMSTR   EQU    $0000
 56 01FF          RAMEND   EQU    $01FF
 57
 58               * DELAY CONSTANTS
 59               *
 60 0DB0          DELAYS   EQU    3504           Delay at slow baud
 61 021B          DELAYF   EQU    539            Delay at fast baud
 62               *
 63 1068          PROGDEL  EQU    4200           2 ms programming delay
 64               *                       At 2.1 MHz
 65
 66               ****************************************************
 67 BF00                           ORG    $BF00
 68               ****************************************************
 69
 70               * Next two instructions provide a predictable place
 71               * to call PROGRAM and UPLOAD even if the routines
 72               * change size in future versions.
 73               *
 74 BF00 7EBF13   PROGRAM  JMP    PRGROUT        EPROM programming utility
 75 BF03          UPLOAD   EQU    *              Upload utility
 76
 77               ****************************************************
 78               * UPLOAD - Utility subroutine to send data from
 79               * inside the MCU to the host via the SCI interface.
 80               * Prior to calling UPLOAD set baud rate, turn on SCI
 81               * and set Y=first address to upload.
 82               * Bootloader leaves baud set, SCI enabled, and
 83               * Y pointing at EPROM start ($D000) so these default
 84               * values do not have to be changed typically.
 85               * Consecutive locations are sent via SCI in an
 86               * infinite loop. Reset stops the upload process.
 87               ****************************************************
 88 BF03 CE1000            LDX    #$1000         Point to internal registers
 89 BF06 18A600   UPLOOP   LDAA   0,Y            Read byte
 90 BF09 1F2E80FC          BRCLR  SCSR,X $80 *   Wait for TDRE
 91 BF0D A72F              STAA   SCDAT,X        Send it
 92 BF0F 1808              INY
 93 BF11 20F3              BRA    UPLOOP         Next...
 94
F
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