SAM3SD8B Atmel Corporation, SAM3SD8B Datasheet - Page 320

• Manufacturer Part Number: SAM3SD8B
• Manufacturer: Atmel Corporation

19.3.3
19.3.4
320
320
SAM3S8/SD8
SAM3S8/SD8
Entering Programming Mode
Programmer Handshaking
Table 19-3.
The following algorithm puts the device in Parallel Programming Mode:
Note:
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.
DATA[15:0]
0x0035
0x001F
0x001E
• Apply GND, VDDIO, VDDCORE and VDDPLL.
• Apply XIN clock within T
• Wait for T
• Start a read or write handshaking.
After reset, the device is clocked by the internal RC oscillator. Before clearing RDY signal, if an
external clock (> 32 kHz) is connected to XIN, then the device switches on the external clock.
Else, XIN input is not considered. A higher frequency on XIN speeds up the programmer
handshake.
POR_RESET
Command Bit Coding (Continued)
Symbol
GSE
WRAM
GVE
POR_RESET
if an external clock is available.
Command Executed
Get Security Bit
Write Memory
Get Version
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12