ATMEGA329P-20AN Atmel, ATMEGA329P-20AN Datasheet - Page 293

• Manufacturer Part Number: ATMEGA329P-20AN
• Description: IC MCU AVR 32K 20MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20AN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 26-7.
Note:
Table 26-8.
Note:
8021G–AVR–03/11
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. Z0: should be zero for all SPM commands, byte select for the LPM instruction. See
Write Section” on page
gramming” on page 286
Read-While-Write Limit (ATmega329P/3290P)
Explanation of different variables used in
(ATmega329P/3290P)
PC[13:6]
PC[5:0]
13
5
282.
for details about the use of Z-pointer during Self-Programming.
(1)
Corresponding
Z-value
Z14:Z7
Z6:Z1
Z14
Z6
”NRWW – No Read-While-Write Section” on page 282
Most significant bit in the Program Counter. (Program Counter is 14 bits
PC[13:0])
Most significant bit which is used to address the words within one page
(64 words in a page requires six/seven 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 PCMSB. 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)
Figure 26-3
Pages
(1)
224
32
and the mapping to the Z-pointer
Address
0x0000 - 0x37FF
0x3800 - 0x3FFF
Description
ATmega329P/3290P
”Addressing the Flash During Self-Pro-
and
”RWW – Read-While-
293