
151
8024A–AVR–04/08
ATmega8HVA/16HVA
27.3
Signature Bytes
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both Programming mode, also when the device is locked. The three bytes
reside in a separate address space. The signature bytes of ATmega8HVA/16HVA is given in
27.4
Calibration Bytes
The ATmega8HVA/16HVA has calibration bytes for the RC Oscillators, internal voltage refer-
ence, internal temperature reference and each differential cell voltage input. These bytes reside
for details.
27.5
Page Size
27.6
Serial Programming
Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while
RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out-
put). After RESET is set low, the Programming Enable instruction needs to be executed first
mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal
SPI interface.
Table 27-5.
Device ID
Part
Signature Bytes Address
0x000
0x001
0x002
ATmega8HVA
0x1E
0x93
0x10
ATmega16HVA
0x1E
0x94
0x0C
Table 27-6.
No. of Words in a Page and No. of Pages in the Flash, ATmega8HVA/16HVA
Device
Flash Size
Page Size
PCWORD
No. of Pages
PCPAGE
PCMSB
ATmega8HVA
4K words (8K bytes)
64 words
PC[5:0]
64
PC[11:6]
11
ATmega16HVA
8K words (16K bytes)
64 words
PC[5:0]
128
PC[12:6]
12
Table 27-7.
No. of Words in a Page and No. of Pages in the EEPROM
EEPROM Size
Page Size
PCWORD
No. of Pages
PCPAGE
EEAMSB
256 bytes
4 bytes
EEA[1:0]
64
EEA[7:2]
7