Rainbow Electronics AT91CAP9S250A - Manual (Page 505)

505
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
34.9.5.3 General Call
The general call is performed in order to change the address of the slave.
If a GENERAL CALL is detected, GACC is set.
After the detection of General Call, it is up to the programmer to decode the commands which
come afterwards.
In case of a WRITE command, the programmer has to decode the programming sequence and
program a new SADR if the programming sequence matches.
Figure 34-26 on page 505 describes the General Call access.
Figure 34-26. Master Performs a General Call
Note: This method allows the user to create an own programming sequence by choosing the program-
ming bytes and the number of them. The programming sequence has to be provided to the
master.
0000000 + W
GENERAL CALL P S A GENERAL CALL Reset or write DADD A New SADR DATA1 A DATA2 A A
New SADR
Programming sequence
TXD
GCACC
SVACC
RESET command = 00000110X
WRITE command = 00000100X
Reset after read