ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 292

• Manufacturer Part Number: ATMEGA168PA-PU
• Description: MCU, 8BIT, AVR, 16K FLASH, 28PDIP
• Manufacturer: Atmel

Specifications of ATMEGA168PA-PU

• Controller Family/series: Atmega
• No. Of I/o's: 23
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 1KB
• Cpu Speed: 20MHz
• No.: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 16KB
• Oscillator Type: External, Internal
• Rohs Compliant: Yes

26.8.15
In
Table 26-10. Boot Size Configuration, ATmega168A/168PA
Table 26-11. Read-While-Write Limit, ATmega168A/168PA
For details about these two section, see
Write Section” on page 280
Table 26-12. Explanation of Different Variables used in
Note:
8271C–AVR–08/10
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 26-10
1
1
0
0
1. Z15:Z14: always ignored
ATmega168A and ATmega168PA Boot Loader Parameters
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
Programming.
BOOTSZ0
ATmega168A/168PA
through
”Addressing the Flash During Self-Programming” on page 284
1
0
1
0
Table
Boot
Size
128 words
256 words
512 words
1024 words
PC[12:6]
Note:
PC[5:0]
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
12
5
26-12, the parameters used in the description of the self programming are given.
The different BOOTSZ Fuse configurations are shown in
Pages
16
2
4
8
”NRWW – No Read-While-Write Section” on page 280
Corresponding
Application
Flash
Section
0x0000 - 0x1F7F
0x0000 - 0x1EFF
0x0000 - 0x1DFF
0x0000 - 0x1BFF
Z-value
Z13:Z7
Z6:Z1
Z13
Z6
(1)
Figure 26-3
Boot
Loader
Flash
Section
0x1F80 - 0x1FFF
0x1F00 - 0x1FFF
0x1E00 - 0x1FFF
0x1C00 - 0x1FFF
Description
Most significant bit in the Program Counter. (The Program Counter
is 13 bits PC[12:0])
Most significant bit which is used to address the words within
one page (64 words in a page requires 6 bits PC [5:0])
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used,
the ZPCMSB equals PCMSB + 1.
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not
used, the ZPAGEMSB equals PAGEMSB + 1.
Program counter page address: Page select, for page erase and
page write
Program counter word address: Word select, for filling temporary
buffer (must be zero during page write operation)
Pages
112
16
and the Mapping to the Z-pointer,
for details about the use of Z-pointer during Self-
End
Application
Section
0x1F7F
0x1EFF
0x1DFF
0x1BFF
Address
0x0000 - 0x1BFF
0x1C00 - 0x1FFF
Figure 26-2 on page
Boot Reset Address (Start Boot
Loader Section)
0x1F80
0x1F00
0x1E00
0x1C00
and
”RWW – Read-While-
282.
292