ATMEGA649-16MI Atmel, ATMEGA649-16MI Datasheet - Page 166
ATMEGA649-16MI
Manufacturer Part Number
ATMEGA649-16MI
Description
IC AVR MCU FLASH 64K 5V 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA649-16MI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
53
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
64-MLF®, 64-QFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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ATmega329/3290/649/6490
• Bit 3 – CPOL: Clock Polarity
When this bit is written to one, SCK is high when idle. When CPOL is written to zero, SCK is low
when idle. Refer to
marized below:
Table 18-3.
• Bit 2 – CPHA: Clock Phase
The settings of the Clock Phase bit (CPHA) determine if data is sampled on the leading (first) or
trailing (last) edge of SCK. Refer to
functionality is summarized below:
Table 18-4.
• Bits 1, 0 – SPR1, SPR0: SPI Clock Rate Select 1 and 0
These two bits control the SCK rate of the device configured as a Master. SPR1 and SPR0 have
no effect on the Slave. The relationship between SCK and the Oscillator Clock frequency f
shown in the following table:
Table 18-5.
SPI2X
0
0
0
0
1
1
1
1
CPOL
CPHA
0
1
0
1
CPOL Functionality
CPHA Functionality
Relationship Between SCK and the Oscillator Frequency
Figure 18-3
SPR1
0
0
1
1
0
0
1
1
and
Leading Edge
Leading Edge
Figure 18-4
Figure 18-3
Sample
Falling
Rising
Setup
SPR0
0
1
0
1
0
1
0
1
for an example. The CPOL functionality is sum-
and
SCK Frequency
f
f
f
f
f
f
f
f
osc
osc
osc
osc
osc
osc
osc
osc
Figure 18-4
/
/
/
/
/
/
/
/
4
16
64
128
2
8
32
64
Trailing Edge
Trailing Edge
for an example. The CPOL
Sample
Falling
Rising
Setup
2552K–AVR–04/11
osc
is
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