at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 437

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

31.9.5.3
Figure 31-27. Master Performs a General Call
6384B–ATARM–15-Dec-08
GCACC
SVACC
TXD
General Call
S
GENERAL CALL
GENERAL CALL
0000000 + W
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 31-27 on page 437
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.
WRITE command = 00000100X
A
RESET command = 00000110X
Reset or write DADD
Reset after read
describes the General Call access.
A
DATA1
Programming sequence
AT91SAM9G20 Preliminary
New SADR
A
DATA2
A
New SADR
A
P
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