ATMEGA325A-MU Atmel, ATMEGA325A-MU Datasheet - Page 279

• Manufacturer Part Number: ATMEGA325A-MU
• Description: IC MCU AVR 32K FLASH 64VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA325A-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K 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: 64-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8285B–AVR–03/11
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
Table 25-7.
Note:
Table 25-8.
Note:
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
1. For details about these two section, see
1. Z15:Z14: always ignored
267
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
Z-pointer during Self-Programming.
Read-While-Write Limit
Explanation of different variables used in
pointer
and
PC[12:6]
”Addressing the Flash During Self-Programming” on page 272
PC[5:0]
12
5
”RWW – Read-While-Write Section” on page
(1)
(ATmega165A/ATmega165PA)
Corresponding
Z-value
Z13:Z7
Z6:Z1
Z13
Z6
(1)
(ATmega165AATmega165PA)
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 six 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)
”NRWW – No Read-While-Write Section” on page
Pages
112
16
Figure 25-3
267.
Description
and the mapping to the Z-
Address
0x0000 - 0x1BFF
0x1C00 - 0x1FFF
for details about the use of
279