265
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
26.7.5
Consideration while updating BLS
Special care must be taken if the user allows the Boot Loader Section to be updated by leaving Boot Lock bit11
unprogrammed. An accidental write to the Boot Loader itself can corrupt the entire Boot Loader, and further soft-
ware updates might be impossible. If it is not necessary to change the Boot Loader software itself, it is
recommended to program the Boot Lock bit11 to protect the Boot Loader software from any internal software
changes.
26.7.6
Prevent reading the RWW section during Self-Programming
During Self-Programming (either Page Erase or Page Write), the RWW section is always blocked for reading. The
user software itself must prevent that this section is addressed during the self programming operation. The
RWWSB in the SPMCSR will be set as long as the RWW section is busy. During Self-Programming the Interrupt
disabled. Before addressing the RWW section after the programming is completed, the user software must clear
26.7.7
Setting the Boot Loader Lock Bits by SPM
To set the Boot Loader Lock bits, write the desired data to R0, write “X0001001” to SPMCSR and execute SPM
within four clock cycles after writing SPMCSR. The only accessible Lock bits are the Boot Lock bits that may pre-
vent the Application and Boot Loader section from any software update by the MCU.
affect the Flash access.
If bits 5:2 in R0 are cleared (zero), the corresponding Boot Lock bit will be programmed if an SPM instruction is
executed within four cycles after BLBSET and SPMEN are set in SPMCSR. The Z-pointer is don’t care during this
operation, but for future compatibility it is recommended to load the Z-pointer with 0x0001 (same as used for read-
ing the lO
ck bits). For future compatibility it is also recommended to set bits 7, 6, 1, and 0 in R0 to “1” when writing
the Lock bits. When programming the Lock bits the entire Flash can be read during the operation.
26.7.8
EEPROM Write prevents writing to SPMCSR
Note that an EEPROM write operation will block all software programming to Flash. Reading the Fuses and Lock
bits from software will also be prevented during the EEPROM write operation. It is recommended that the user
checks the status bit (EEPE) in the EECR Register and verifies that the bit is cleared before writing to the SPMCSR
Register.
26.7.9
Reading the Fuse and Lock Bits from software
It is possible to read both the Fuse and Lock bits from software. To read the Lock bits, load the Z-pointer with
0x0001 and set the BLBSET and SPMEN bits in SPMCSR. When an LPM instruction is executed within three CPU
cycles after the BLBSET and SPMEN bits are set in SPMCSR, the value of the Lock bits will be loaded in the des-
tination register. The BLBSET and SPMEN bits will auto-clear upon completion of reading the Lock bits or if no
LPM instruction is executed within three CPU cycles or no SPM instruction is executed within four CPU cycles.
The algorithm for reading the Fuse Low byte is similar to the one described above for reading the Lock bits. To
read the Fuse Low byte, load the Z-pointer with 0x0000 and set the BLBSET and SPMEN bits in SPMCSR. When
an LPM instruction is executed within three cycles after the BLBSET and SPMEN bits are set in the SPMCSR, the
Bit
7
65
43
21
0
R0
1
BLB12
BLB11
BLB02
BLB01
1
Bit
7
65
43
21
0
Rd
–
BLB12
BLB11
BLB02
BLB01
LB2
LB1