ATMEGA644-20PU Atmel, ATMEGA644-20PU Datasheet - Page 22

• Manufacturer Part Number: ATMEGA644-20PU
• Description: IC AVR MCU FLASH 64K 40DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644-20PU

• 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: 32
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K 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: 40-DIP (0.600", 15.24mm)
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: 2-Wire/SPI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRRZ541, ATAVRRAVEN, ATAVRRZRAVEN, ATAVRRZUSBSTICK, ATAVRRZ201
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Controller Family/series: AVR MEGA
• No. Of I/o's: 32
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Rohs Compliant: Yes
• Package: 40PDIP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 20 MHz
• For Use With: ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.11
9.12
9.13
9.14
2593NS–AVR–07/10
Rev. 2593D - 04/06
Rev. 2593C - 03/06
Rev. 2593B - 03/06
Rev. 2593A-06/05
1.
1.
2.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Initial revision.
Updated
Updated
Added “Not recommended in new designs”.
Removed RAMPZ– Extended Z-pointer Register for ELPM/SPM from datasheet.
Updated
Updated code example in
Updated
Updated
Removed the occurancy of ATmega164 and ATmega324.
Updated Adresses in Registers.
Updated
Updated SRAM sizes in
Updated
Updated
Updated Register bit Discription in
Updated Note in
Updated Feauters in
Changed name from “SFIOR“ to “ADCSRB“ in
”Bit 5 – ADATE: ADC Auto Trigger Enable” on page 250
Reserved Bits” on page
Updated
Updated
Updated
Updated Example in
Updated
Updated
Updated
Updated
1 on page
322,
Table 27-1 on page
”Bit 6 – ACBG: Analog Comparator Bandgap Select” on page
”Prescaling and Conversion Timing” on page
Table 10-1 on page
”Setting the Boot Loader Lock Bits by SPM” on page
”Register Summary” on page
”Architectural Overview” on page
”I/O Memory” on page
”PRR – Power Reduction Register” on page
”Signature Bytes” on page
”DC Characteristics” on page
”Typical Characteristics” on page
”Register Summary” on page
Figure 6-2 on page 18
”Errata” on page
Table 9-1 on page
260,
Table 25-7 on page
”Overview of the TWI Module” on page
”Supply Current of IO modules” on page
”Analog-to-digital Converter” on page
251.
”SRAM Data Memory” on page
331,
”Interrupt Vectors in ATmega644” on page
365.
47,
55.
Table 27-2 on page
20.
Table 9-4 on page 51,Table 10-1 on page 55,Table 23-
and
”Register Description” on page
287.
287,
Figure 21-1 on page
354.
316.
354.
Table 25-15 on page 299,Table 26-6 on page
9.
326.
”Starting a Conversion” on page
332.
44.
236.
18.
206.
234.
233.
331.
276.
and
ATmega644
146.
”Bit 7, 5:3 – Res:
55.
231.
235, in
22