ATmega640 Atmel Corporation, ATmega640 Datasheet - Page 381
ATmega640
Manufacturer Part Number
ATmega640
Description
Manufacturer
Atmel Corporation
Specifications of ATmega640
Flash (kbytes)
64 Kbytes
Pin Count
100
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
86
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
5
Twi (i2c)
1
Uart
4
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
6
Output Compare Channels
16
Input Capture Channels
4
Pwm Channels
15
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Table 31-15. External Data Memory Characteristics, 2.7 to 5.5 Volts, No Wait-state (Continued)
Notes:
Table 31-16. External Data Memory Characteristics, 2.7 to 5.5 Volts, SRWn1 = 0, SRWn0 = 1
2549N–AVR–05/11
1
2
3a
3b
4
5
6
7
8
9
10
11
12
13
14
15
16
0
10
12
15
16
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Symbol
1/t
t
t
t
t
LHLL
AVLL
LLAX_ST
LLAX_LD
AVLLC
AVRL
AVWL
LLWL
LLRL
DVRH
RLDV
RHDX
RLRH
DVWL
WHDX
DVWH
WLWH
RLDV
RLRH
DVWH
WLWH
1. This assumes 50% clock duty cycle. The half period is actually the high time of the external clock, XTAL1.
2. This assumes 50% clock duty cycle. The half period is actually the low time of the external clock, XTAL1.
CLCL
Parameter
ALE Pulse Width
Address Valid A to ALE Low
Address Hold After ALE Low,
write access
Address Hold after ALE Low,
read access
Address Valid C to ALE Low
Address Valid to RD Low
Address Valid to WR Low
ALE Low to WR Low
ALE Low to RD Low
Data Setup to RD High
Read Low to Data Valid
Data Hold After RD High
RD Pulse Width
Data Setup to WR Low
Data Hold After WR High
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Valid to WR High
WR Pulse Width
Min
235
115
115
235
235
115
115
235
105
235
250
235
Min
485
500
485
45
5
5
0
4MHz Oscillator
4MHz Oscillator
ATmega640/1280/1281/2560/2561
Max
Max
130
130
190
440
0.5t
0.5t
0.5t
0.5t
0.5t
1.0t
1.0t
1.0t
1.0t
1.0t
2.0t
2.0t
t
1.0t
2.0t
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Min
Min
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
0.0
45
5
5
0
Variable Oscillator
Variable Oscillator
CLCL
CLCL
-15
-10
-10
-10
-10
-20
-15
-15
-15
-15
-15
-15
-15
(1)
(1)
(2)
(2)
(1)
0.5t
0.5t
1.0t
2.0t
CLCL
CLCL
Max
Max
CLCL
CLCL
8
+5
+5
-60
-60
(2)
(2)
Unit
Unit
MHz
ns
ns
381
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