Rainbow Electronics ATmega32L - Manual (Page 250)

250
ATmega32(L)
2503C–AVR–10/02
See Table 96 and Table 97 for how the different settings of the Boot Loader bits 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
SPMCR. The Z-pointer is don’t care during this operation, but for future compatibility it is
recommended to load the Z-pointer with $0001 (same as used for reading the Lock
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.
EEPROM Write Prevents
Writing to SPMCR 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 (EEWE)
in the EECR register and verifies that the bit is cleared before writing to the SPMCR
register.
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 $0001 and set the BLBSET and SPMEN bits in SPMCR. When
an LPM instruction is executed within three CPU cycles after the BLBSET and SPMEN
bits are set in SPMCR, the value of the Lock bits will be loaded in the destination regis-
ter. 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. When BLBSET and SPMEN are cleared, LPM will
work as described in the Instruction set Manual.
The algorithm for reading the Fuse Low bits is similar to the one described above for
reading the Lock bits. To read the Fuse Low bits, load the Z-pointer with $0000 and set
the BLBSET and SPMEN bits in SPMCR. When an LPM instruction is executed within
three cycles after the BLBSET and SPMEN bits are set in the SPMCR, the value of the
Fuse Low bits (FLB) will be loaded in the destination register as shown below. Refer to
Table 106 on page 256 for a detailed description and mapping of the Fuse Low bits.
Similarly, when reading the Fuse High bits, load $0003 in the Z-pointer. When an LPM
instruction is executed within three cycles after the BLBSET and SPMEN bits are set in
the SPMCR, the value of the Fuse High bits (FHB) will be loaded in the destination reg-
ister as shown below. Refer to Table 105 on page 255 for detailed description and
mapping of the Fuse High bits.
Fuse and Lock bits that are programmed, will be read as zero. Fuse and Lock bits that
are unprogrammed, will be read as one.
Preventing Flash Corruption During periods of low V
CC,
the Flash program can be corrupted because the supply volt-
age is too low for the CPU and the Flash to operate properly. These issues are the same
as for board level systems using the Flash, and the same design solutions should be
applied.
A Flash program corruption can be caused by two situations when the voltage is too low.
First, a regular write sequence to the Flash requires a minimum voltage to operate
Bit 7 6 5 4 3 2 1 0
Rd – – BLB12 BLB11 BLB02 BLB01 LB2 LB1
Bit 7 6 5 4 3 2 1 0
Rd FLB7 FLB6 FLB5 FLB4 FLB3 FLB2 FLB1 FLB0
Bit 7 6 5 4 3 2 1 0
Rd FHB7 FHB6 FHB5 FHB4 FHB3 FHB2 FHB1 FHB0