Oops, i must answer my own reply.
It seems to me, that i'm wrong completely.
But in my example i have forgotten, that the second (and third, but that can
be ignored in this case) b'0011' would setup the LCD into 8bit mode. So
there are 2 scenarios:

Scenario 1:
                  uP                                                   LCD
  the uP is powered up                         LCD is powered up and set to
4bit mode
  uP resets because of whatever                LCD is still working in 4bit
mode
  uP sends 0x3 (1st part of init sequence)     LCD receives 0x3 as MSB of
function set
  uP sends 0x3 (2nd part of init sequence)     LCD receives 0x3 as LSB of
fucntion set, LCD setting to 8bit mode !!!
  uP sends 0x3 (3rd part of init sequence)     LCD receives 0x3x (function
set)
  here can be any number of additional 0x3 ....
  uP sends 0x2 (set 4bit i/f)                  LCD receives 0x2x (function
set), LCD setting to 4bit mode !!!
  uP sends MSB of 0x2x                         LCD receives 0x2 as MSB of
function set
  uP sends LSB of 0x2x (b'NF00')               LCD receives b'NF00'
  .
  uP and LCD are synchron

Scenario 2:
                  uP                                                   LCD
  the uP is powered up                         LCD is powered up and set to
4bit mode
  send MSB of 0x8x (set DDRAM address)         LCD receives 0x8 (MSB of set
DDRAM address)
  uP resets because of whatever                LCD is still working in 4bit
mode, waiting for LSB !!!
  uP sends 0x3 (1st part of init sequence)     LCD receives 0x3 as LSB of
DDRAM address
  uP sends 0x3 (2nd part of init sequence)     LCD receives 0x3 as MSB of
fucntion set
  uP sends 0x3 (3rd part of init sequence)     LCD receives 0x3 as LSB of
function set, LCD is set to 8bit mode !!!
  here can be any number of additional 0x3 ....
  uP sends 0x2 (set 4bit i/f)                  LCD receives 0x2x (function
set), setting LCD into 4bit mode !!!
  uP sends MSB of 0x2x                         LCD receives 0x2 as MSB of
function set
  uP sends LSB of 0x2x (b'NF00')               LCD receives b'NF00'
  .
  uP and LCD are synchron


Both scenarios would end up in a correctly initialized LCD, the uP and the
LCD are synchron together.

To Jan: You are correct, at least 3 0x3 are required for initialization.
  But i think it can be any (even or odd) number, as long as there are at
least 3 0x3.

Thanks to Jim and Quentin for your answers in depth.

Frank

GSP Sprachtechnologie GmbH
Frank Wollenberg
HW-Entwicklung
Tel.:   +49 (0)30 769929-78
Fax:    +49 (0)30 769929-12
eMail:  f.wollenberg@gsp-berlin.de


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