FLASH BOOTLOADER



This documents the use of the 128K flash bootloader option.
			
This must be used with a Micropac 535 rev 2 or newer. 
It will only work with 32k of RAM; it will not work with 128K of RAM.

The following jumper settings are required:

  JP2	o-o o a		JP1	1 2 3 4 5 6
	o-o o b			o-o o-o o o
	1 3 5




The flash bootloader program allows an Intel Hex file to be sent into flash memory through the CN1 serial port in 8-N-1 format at 9600 baud.  

Note that there is no hardware handshaking (e.g. RTS/CTS or XON/XOFF) 
implemented between the host and the bootstrap system. 


 On reset the following is displayed on the terminal:

| 
| BOOTLOADER VERSION 1.1
|
| Press the space key within 2 seconds to allow upload.
|
|

If the space key is not pressed, the application residing at 0:0000 will start, otherwise
the following will be displayed:
| 
| Enter the number of upload files (1 or 2) or any other key to exit upload mode.
| 
| 
| NOTE:  Attempting to upload a file will erase the program
|        regardless of whether the upload is successful.
| 

If 1 is selected then the program will erase the memory range from 0:0000 to 0:ffff
after displaying the following:

| 
| Erasing firmware
| ....
| Send Hex file #1

At this point the program is ready for a hex file to be downloaded.  The hex file
should start at memory address 0000h.  No offsets are necessary, unlike most 
bootloaders that load into RAM.

If 2 had been selected as "the number of upload files" option, then after the first
file had been successful downloaded, the program will erase the memory range from 
1:4000 to 1:bfff after displaying the following:

| 
| Erasing firmware
| ..
| Send Hex file #2