I have built my own programmer for the PIC16F84 based on Microchip's
AN589 "A PC based development programmer" and written the programming
software for it based on Microchip's DS30262C "EEPROM memory
programming specifications".
 All commands work just fine, except for the BULK ERASE PROGRAM MEMORY
and BULK ERASE DATA MEMORY.
 Information in DS30262C is very confusing and there are also a lot of
typos in the section explaining the correct sequence of commands to
perform Bulk Erase.

Here is a detailed description of the problem.

 On page 5 of DS30262C : "TABLE 2-1: COMMAND MAPPING FOR
PIC16F83/CR83/F84/CR84"
 This I will refer to later.

 On page 8 of DS30262C, section 2.3.1.9 :

==================================
2.3.1.9 BULK ERASE PROGRAM MEMORY
After this command is performed, the next program
command will erase the entire program memory.
To perform a bulk erase of the program memory, the following
sequence must be performed.
1. Do a tLoad Data All 1Fsv command.
2. Do a tBulk Erase User Memoryv command.
3. Do a tBegin Programmingv command.
4. Wait 10 ms to complete bulk erase.
If the address is pointing to the test program memory
(0x2000 - 0x200F), then both the user memory and the
test memory will be erased. The configuration word will
not be erased, even if the address is pointing to location
0x2007
For PIC16F84 perform the following commands:
1. Issue Command 2 (write program memory).
2. Send out 3FFFH data.
3. Issue Command 1 (toggle select even rows).
4. Issue Command 7 (toggle select even rows).
5. Issue Command 8 (begin programming)
6. Delay 10 ms
7. Issue Command 1 (toggle select even rows).
8. Issue Command 7 (toggle select even rows).

Note: If the device is code-protected
(PIC16F84A), the BULK ERASE com-mand
will not work.
====================================
My understanding of this portion of text is the following, please
correct me if I am wrong :

For PIC16F84 (code protection disabled), based on Table 2-1:
- Issue command LOAD DATA FOR PROGRAM MEMORY, DATA=0x3FFFh
- Issue command LOAD CONFIGURATION, DATA=???? (what is the meaning of
"toggle select even rows" here)
- Issue command READ DATA FROM DATA MEMORY (what is the meaning of
"toggle select even rows" here)
- Issue command BULK ERASE PROGRAM MEMORY. (what is the meaning of
"begin programming" here, if command 8 is something else?)
- Delay 10ms.
- Issue command LOAD CONFIGURATION, DATA=???? (what is the meaning of
"toggle select even rows" here)
- Issue command READ DATA FROM DATA MEMORY (what is the meaning of
"toggle select even rows" here)

This sequence of commands does not work.
This is what I can figure out from the text. Please clarify this for
me. Thank you.

Taking the command sequence from the first paragraph and performing:
- Issue command LOAD DATA FOR PROGRAM MEMORY, DATA=0x3FFFh
- Issue command BULK ERASE PROGRAM MEMORY
- Issue command BEGIN PROGRAMMING
- Delay 10ms

This sequence does not work either.
Note: I performed these commands as the first thing after entering
programming mode. Also, code protection is NOT active.


 On page 9 of DS30262C, section 2.3.1.10:

===========================
2.3.1.10 BULK ERASE DATA MEMORY
To perform a bulk erase of the data memory, the follow-ing
sequence must be performed.
1. Do a tLoad Data All 1Fsv command.
2. Do a tBulk Erase Data Memoryv command.
3. Do a tBegin Programmingv command.
4. Wait 10 ms to complete bulk erase.
For PIC16F84 perform the data memory).
5. Send out 3FFFH data.
6. Issue Command 1 (toggle select even rows).
7. Issue Command 7 (toggle select even rows).
8. Issue Command 8 (begin data)
9. Delay 10 ms
10. Issue Command 1 (toggle select even rows).
Issue Command 7 (toggle select even rows).    // should this be line
11?

Note: All BULK ERASE operations must take
place at 4.5 to 5.5 VDD range.
==============================

This is even more confusing. The numbering of lines continues, but in
the previous section, when taking PIC16F84 as a separate case, the
numbering restarts from 1.

I cannot understand what commands to perform here :
- Issue command ??????????, DATA=0x3FFFh
- Issue command LOAD CONFIGURATION, DATA=???? (what is the meaning of
"toggle select even rows" here)
- Issue command READ DATA FROM DATA MEMORY (what is the meaning of
"toggle select even rows" here)
- Issue command BULK ERASE PROGRAM MEMORY (this is command 8 in Table
2-1. Why not BULK ERASE DATA MEMORY? what is the meaning of "begin
data" ?)
- Delay 10ms
- Issue command LOAD CONFIGURATION, DATA=???? (what is the meaning of
"toggle select even rows" here)
- Issue command READ DATA FROM DATA MEMORY (what is the meaning of
"toggle select even rows" here)

This section seems incomplete and with errors, maybe not just typos.

Considering the first paragraph, lines numbered 1 through 4:

- Issue command LOAD DATA FROM DATA MEMORY, DATA=0x3FFFh (is it DATA or
PROGRAM MEMORY, it is not clear)
- Issue command BULK ERASE DATA MEMORY
- Issue BEGIN PROGRAMMING
- Delay 10ms

This sequence does not work either.

Note: All programming operations were performed while supply of the
device was 4.97V-4.99V, which was monitored continuosly.

Note: All other commands work properly as described in this document
and I have succesfully programmed several devices with this programmer
and programming software.
It has been developed under FreePascal 1.04 (DOS Go32v2) and it will be
released under the GNU Public License version 2 as soon as I can make
these commands to work.
It will be available at http://members.tripod.com/andrei_b.


References used for this development:

- PIC16F84 datasheet
- PIC16F84A datasheet
- PIC16C84 datasheet
- AN 589 - A PC based development programmer
- DS30262C - EEPROM Memory Programming Specification PIC16F8XX

Thank you in advance for your help.

Andrei Boros aka Andrix.




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