Test program check Programmer

[seanshpark]

A simple blink program will do to check the Programmer is working OK.

• use sdcc
• compile blink.asm source

sdcc

• https://sdcc.sourceforge.net/doc/sdccman.pdf

8051 instruction set

• https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/UserGuides/doc0509.pdf

8051 hardware manual

• https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/UserGuides/doc4316.pdf

[seanshpark]

8051 Stack: push will increment SP

How to init SP value?

• there seems no direct way
• global buffer declaration relocate SP address

one of compile output file .mem will show RAM usage

• with some global variables

  Internal RAM layout:
    0 1 2 3 4 5 6 7 8 9 A B C D E F
  0x00:|0|0|0|0|0|0|0|0|a|a|a|a|a|a|a|a|
  0x10:|a|a|a|a|a|a|a|a|a|a|a|a|S|S|S|S|
  0x20:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|

How to use bit space?

• use __bit as data type

  __bit flag_a, flag_b;

• compiler will optimize and removed if possible
• with some __bit variables

  Internal RAM layout:
    0 1 2 3 4 5 6 7 8 9 A B C D E F
  0x00:|0|0|0|0|0|0|0|0|a|a|a|a|a|a|a|a|
  0x10:|a|a|a|a|a|a|a|a|a|a| | | | | | |
  0x20:|B|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
  0x30:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|

How to use register bank 1, 2, 3 ?

• used in interrupt service routines

  void timer0_isr(void) __interrupt (1) __using (1) { ... }

• __using (2) -> use bank 2
• with __using (1)

  Internal RAM layout:
    0 1 2 3 4 5 6 7 8 9 A B C D E F
  0x00:|0|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|
  0x10:| | | | | | | | | | | | | | | | |
  0x20:|B|a|a|a|a|a|a|a|a|a|a|a|a|a|a|a|
  0x30:|a|a|a|S|S|S|S|S|S|S|S|S|S|S|S|S|

[seanshpark]

Test with my old SE-511p programmer

• Use USB-RS232, set as COM1
• Run se516v31.exe as Admin
• Use DC power adaptor with 15V, there is 78L12 regulator so it's OK
• Change HEX file LF to CRLF to make Windows friendly

Low Vpp voltage will fail to write.

[seanshpark]

done