Rainbow Electronics ATmega3290P_V User Manual
Page 283
283
ATmega329/3290/649/6490
2552H–AVR–11/06
Note:
1. The SPIEN Fuse is not accessible in serial programming mode.
2. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 120 on
page 280 for details.
3. See “WDTCR – Watchdog Timer Control Register” on page 46 for details.
4. Never ship a product with the OCDEN Fuse programmed regardless of the setting of
Lock bits and JTAGEN Fuse. A programmed OCDEN Fuse enables some parts of the
clock system to be running in all sleep modes. This may increase the power
consumption.
5. If the JTAG interface is left unconnected, the JTAGEN fuse should if possible be dis-
abled. This to avoid static current at the TDO pin in the JTAG interface.
Note:
1. The default value of SUT1..0 results in maximum start-up time for the default clock
source. See Table 16 on page 41 for details.
2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 8 MHz. See
Table 7 on page 28 for details.
3. The CKOUT Fuse allow the system clock to be output on PORTE7. See “Clock Out-
put Buffer” on page 31 for details.
4. See “System Clock Prescaler” on page 31 for details.
Table 126. Fuse High Byte
Fuse High Byte
Bit No
Description
Default Value
OCDEN
(4)
7
Enable OCD
1 (unprogrammed,
OCD disabled)
JTAGEN
(5)
6
Enable JTAG
0 (programmed, JTAG
enabled)
SPIEN
(1)
5
Enable Serial Program and Data
Downloading
0 (programmed, SPI
prog. enabled)
WDTON
(3)
4
Watchdog Timer always on
1 (unprogrammed)
EESAVE
3
EEPROM memory is preserved
through the Chip Erase
1 (unprogrammed,
EEPROM not
preserved)
BOOTSZ1
2
Select Boot Size (see Table 128
for details)
0 (programmed)
(2)
BOOTSZ0
1
Select Boot Size (see Table 128
for details)
0 (programmed)
(2)
BOOTRST
0
Select Reset Vector
1 (unprogrammed)
Table 127. Fuse Low Byte
Fuse Low Byte
Bit No
Description
Default Value
CKDIV8
(4)
7
Divide clock by 8
0 (programmed)
CKOUT
(3)
6
Clock output
1 (unprogrammed)
SUT1
5
Select start-up time
1 (unprogrammed)
(1)
SUT0
4
Select start-up time
0 (programmed)
(1)
CKSEL3
3
Select Clock source
0 (programmed)
(2)
CKSEL2
2
Select Clock source
0 (programmed)
(2)
CKSEL1
1
Select Clock source
1 (unprogrammed)
(2)
CKSEL0
0
Select Clock source
0 (programmed)
(2)