ATMEGA88PA-CCU Atmel, ATMEGA88PA-CCU Datasheet - Page 271
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ATMEGA88PA-CCU
Manufacturer Part Number
ATMEGA88PA-CCU
Description
IC MCU AVR 8K FLASH 32VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA88PA-CCU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VFQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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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