If you have suggestions for improvements or find any bugs please submit
via fax or e-mail with the heading "BUG in 515MON21"

	fax. 618-457-0110
	support@emacinc.com



This document supercedes ATBMON.DOC and documents the improvements made to
the monitor in version X2.1a.

The backspace key can now be used to erase a character.

Access to all of the C515C's SFRs is possible now through the addition of
the following: 

	ADCON0, ADCON1, ADDATH, ADDATL, 
	CCEN, CCH1, CCH2, CCH3, CCL1, CCL2, CCL3, CRCH, CRCL, 
	DAPR, DIR5, DPSEL, IEN1, IEN2, IP1, IRCON, 
	P2, P4, P5, P6, P7, PCON1, PCON, SBUF, SCF, SCIEN,
	 SRB, SRELH, SRELL, SSCCON, SSCMOD, STB, SYSCON,
	T2CON, TH0, TH1, TH2, TL0, TL1, TL2, WDTREL, XPAGE

The IE and IP SFRs were replaced with IEN0 and IP0 respectively.

DBYTE was modified to allow access to internal RAM addresses 80 to FF.

The HELP command was added which displays an abbreviated command summary.

UPLOAD/DOWNLOAD have been changed so all I/O is through the main serial port.
UPLOAD no longer gives the "LOADING" message and no CTRL-Z or RUBOUT are
output at the end of the hex file.  DOWNLOAD no longer expects or sends
a comment.  Also, it now grabs the checksum on the end record (though 
it doesn't check it).

SEND has been eliminated.

Interrupt vectors for the C515C have been added and are offset to 8000h.

8003H    IE0
800BH    TF0
8013H    IE1
801BH    TF1
8023H    RI/TI
802BH    TF2/EXF2
8043H    IADC
804BH    IEX2
8053H    IEX3
805BH    IEX4
8063H    IEX5
806BH    IEX6
807BH    Wake-up
808BH    CAN
8093H    SSC TC/WCOL
80A3H    IEX7
80ABH    IEX8


GETTING STARTED

The MicroPac 515C memory jumpers must be set up in "PROGRAM/DATA CONFIGURATION".  Refer that section of the MicroPac 515C Hardware manual.

Connect the main serial (CN1) port to a terminal or terminal emulator with no parity, 8 data and 1 stop bit and a baud rate of 9600. Power-up the board and if everything is connected and configured correctly, the following will appear on the terminal window:

MCS-51 MONITOR X2.1a
*

Once communication has been established you can now type "HELP" and enter,
to see an abbreviated command list.  Type DOWNLOAD and enter to ready 
the monitor to receive an Intel hex file.  Send the hex file that is on
the distribution disk (the file with the ".HEX" extension) to the Micropac
535 using the text transfer (or file upload) function of your terminal 
emulator.  Once initiated, you will see each line of the hex file as it
is loading into the board (each hex file line will write over the previous line on the terminal display).  

When it is done, you will see the "*" prompt.  You may now start the program
by typing "MGO 8000" and enter.

If you want to single-step or set breakpoints, don't execute the
init section of the program since this section changes parameters
used by the monitor.  Instead, start at the section you want to debug.
You may want to install a JMP instruction over the init section until
your program is debugged.