ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 300
ATMEGA644A-PU
Manufacturer Part Number
ATMEGA644A-PU
Description
IC MCU AVR 64K FLASH 40PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-PU
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)
1.8 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
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
JTAG, TWI, SPI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8272A–AVR–01/10
Table 26-9.
Table 26-10. BS2 and BS1 Encoding
,
Table 26-11. Pin Values Used to Enter Programming Mode
Table 26-12. XA1 and XA0 Enoding
164A/164PA/324A/324PA/644A/644PA/1284/1284P
BS2
0
0
1
1
Programming Mode
Signal Name in
XA1
0
0
1
1
RDY/BSY
PAGEL
DATA
BS1
XA0
XA1
BS2
BS1
0
1
0
1
WR
OE
PAGEL
XA1
XA0
BS1
Pin
Pin Name Mapping
XA0
Flash / EEPROM
Address
Low Byte
High Byte
Extended High
Byte
Reserved
0
1
0
1
Pin Name
PB7-0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0
Action when XTAL1 is Pulsed
Load Flash or EEPROM Address (High or low address byte determined
by BS2 and BS1).
Load Data (High or Low data byte for Flash determined by BS1).
Load Command
No Action, Idle
Flash Data
Loading /
Reading
Low Byte
High Byte
Reserved
Reserved
I/O
I/O
O
I
I
I
I
I
I
I
Prog_enable[3]
Prog_enable[2]
Prog_enable[1]
Prog_enable[0]
Symbol
Function
0: Device is busy programming, 1: Device is ready for
new command.
Output Enable (Active low).
Write Pulse (Active low).
Byte Select 1.
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load.
Byte Select 2.
Bi-directional Data bus (Output when OE is low).
Fuse
Programming
Low Byte
High Byte
Extended Byte
Reserved
Value
Reading Fuse
and Lock Bits
Fuse Low Byte
Lockbits
Extended Fuse
Byte
Fuse High Byte
0
0
0
0
300
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