Rainbow Electronics ATmega162V - Manual (Page 232)

232
ATmega162/V
2513E–AVR–09/03
Notes: 1. The SPIEN Fuse is not accessible in SPI Serial Programming mode.
2. The default value of BOOTSZ1:0 results in maximum Boot Size. See Table 94 on
page 228 for details.
3. Never ship a product with the OCDEN Fuse programmed regardless of the setting of
Lock bits and the 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.
4. 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.
Notes: 1. The default value of SUT1:0 results in maximum start-up time for the default clock
source. See Table 12 on page 37 for details.
2. The default setting of CKSEL3:0 results in Internal RC Oscillator @ 8 MHz. See
Table 5 on page 34 for details.
3. The CKOUT Fuse allow the system clock to be output on PortB 0. See “Clock output
buffer” on page 38 for details.
4. See “System Clock Prescaler” on page 39 for details.
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are
locked if Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the
Lock bits.
Table 100. Fuse High Byte
Fuse Low Byte Bit no Description Default Value
OCDEN (3) 7 Enable OCD
1 (unprogrammed, OCD
disabled)
JTAGEN (4) 6 Enable JTAG
0 (programmed, JTAG
enabled)
SPIEN (1) 5
Enable Serial Program and Data
Downloading 0 (programmed, SPI prog.
enabled)
WDTON 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 94 for
details)
0 (programmed) (2)
BOOTSZ0 1
Select Boot Size (see Table 94 for
details)
0 (programmed) (2)
BOOTRST 0 Select Reset Vector 1 (unprogrammed)
Table 101. 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)