Datasheet

294
11011B–ATARM–21-Feb-12
SAM3N
19.2.3 Entering Programming Mode
The following algorithm puts the device in Parallel Programming Mode:
• Apply GND, VDDIO, VDDCORE and VDDPLL.
• Apply XIN clock within T
POR_RESET
if an external clock is available.
•Wait for T
POR_RESET
• Start a read or write handshaking.
19.2.4 Programmer Handshaking
An handshake is defined for read and write operations. When the device is ready to start a new
operation (RDY signal set), the programmer starts the handshake by clearing the NCMD signal.
The handshaking is achieved once NCMD signal is high and RDY is high.
19.2.4.1 Write Handshaking
For details on the write handshaking sequence, refer to Figure 19-3 Figure 19-4 and Table 19-4 .
Figure 19-3. SAM3NxB/C (64/100 pins) Parallel Programming Timing, Write Sequence
Figure 19-4. SAM3NxA (48 pins) Parallel Programming Timing, Write Sequence
NCMD
RDY
NOE
NVALID
DATA[7:0]
MODE[3:0]
1
2
3
4
5
NCMD
RDY
NOE
NVALID
DATA[15:0]
MODE[3:0]
1
2
3
4
5