ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 271

MCU, 8BIT, AVR, 16K FLASH, 28PDIP

ATMEGA168PA-PU

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

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

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA168PA-PU
Manufacturer:
TI
Quantity:
1 240
25.1.3
25.2
8271C–AVR–08/10
Addressing the Flash During Self-Programming
Performing a Page Write
SPMCSR. It is also erased after a system reset. Note that it is not possible to write more than
one time to each address without erasing the temporary buffer.
If the EEPROM is written in the middle of an SPM Page Load operation, all data loaded will be
lost.
To execute Page Write, set up the address in the Z-pointer, write “00000101” to SPMCSR and
execute SPM within four clock cycles after writing SPMCSR. The data in R1 and R0 is ignored.
The page address must be written to PCPAGE. Other bits in the Z-pointer must be written to
zero during this operation.
• The CPU is halted during the Page Write operation.
The Z-pointer is used to address the SPM commands.
Since the Flash is organized in pages (see
be treated as having two different sections. One section, consisting of the least significant bits, is
addressing the words within a page, while the most significant bits are addressing the pages.
This is shown in
are addressed independently. Therefore it is of major importance that the software addresses
the same page in both the Page Erase and Page Write operation.
The LPM instruction uses the Z-pointer to store the address. Since this instruction addresses the
Flash byte-by-byte, also the LSB (bit Z0) of the Z-pointer is used.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Bit
ZH (R31)
ZL (R30)
Figure 26-3 on page
Z15
15
Z7
7
Z14
14
Z6
6
Z13
13
Z5
5
284. Note that the Page Erase and Page Write operations
Table 27-11 on page
Z12
12
Z4
4
Z11
11
Z3
3
Z10
10
Z2
2
301), the Program Counter can
Z9
Z1
9
1
Z8
Z0
8
0
271

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