
156
8024A–AVR–04/08
ATmega8HVA/16HVA
27.7
High-voltage Serial Programming
This section describes how to program and verify Flash Program memory, EEPROM Data mem-
ory, Lock bits and Fuse bits in the ATmega8HVA/16HVA.
Figure 27-3. High-voltage Serial Programming
Table 27-11. Pin Name Mapping
Signal Name in High-voltage
Serial Programming Mode
Pin Name
I/O
Function
SDO
PB1
O
Serial Data Output
SDI
PB2
I
Serial Data Input
SII
PB3
I
Serial Instruction Input
SCI
PC0
I
Serial Clock Input (min. 2/f
ck period)
Table 27-12. Pin Values Used to Enter Programming Mode
Pin Name
Symbol
Value
PB0
Prog_enable[0]
0
PB1
Prog_enable[1]
0
PB2
Prog_enable[2]
0
PB3
Prog_enable[3]
0
VCC
GND
SDO
SII
SCI
RESET
+3.0 - 3.5V
PC0
PB3
PB1
+11.5 - 12.5V
PB2
SDI
Prog_enable[0]
PB0