Example Of Eeprom Access - Dalsa 1M75-SA User Manual

50
Command
Read
Write
Write disable
Write enable
Abbreviations
0:
1:
X:

Example of EEPROM access

Table 20 summarizes the sequence of commands for data transmission to the EEPROM of
the camera. Depending on the access function, some steps may not be necessary. To write
to the EEPROM, steps 1-5 are necessary. To read from the EEPROM, skip step 1, but use
steps 2-7. Special cases are the EEPROM commands write enable/disable. In these cases
only the steps 3-5 have to be used. The transmission protocol of the RS232 interface is
defined in Appendix C.
Table 20: Access steps for the EEPROM
Step
1
2
3
4
5
6
7
The following example shows in detail the sequence of commands for the EEPROM
command write enable.
03-32-00525-03
PRELIMINARY
Bit 4
1
0
0
0
Logical state 0
Logical state 1
arbitrary state
Action
Write data byte (D7-D0) in register address 00H, if required for function
Write LSB address byte (A7-A0) in register address 01H, if required for function
Write OP-Code und MSB address byte (xxx,OP1, OP2,A10-A8) in register address
02H
Read status register address 04H, wait for state „not (PROM_BUSY or
AUTOLOAD)"
Write in register address 03H Ł command SEND_PROM
Read status register address 04H, wait for state „not (PROM_BUSY or
AUTOLOAD)"
Read databyte (D7-D0) in register address 00H, when data are read out from the
EEPROM
Bit 3 Bit 2 Bit 1
0 A10 A9
1 A10 A9
0 0 0
0 1 1
1M28 and 1M75 User's Manual
Bit 0
A8
A8
X
X
DALSA