ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 333

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.5
7674F–AVR–09/09
SPI Timing Characteristics
See
Table 26-6.
Note:
Figure 26-3. SPI Interface Timing Requirements (Master Mode)
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
Figure 26-3 on page 333
(Data Output)
(Data Input)
(CPOL = 0)
(CPOL = 1)
1. In SPI Programming mode the minimum SCK high/low period is:
2. Values indicated represent typical data from design simulation.
- 2 t
- 3 t
MISO
MOSI
SS high to tri-state
SCK
SCK
SCK to out high
SCK to SS high
SCK high/low
SS low to SCK
SS
Rise/Fall time
SCK high/low
SS low to out
Rise/Fall time
SPI Timing Parameters
Description
CLCL
CLCL
SCK period
SCK period
Out to SCK
SCK to out
SCK to out
Setup
Setup
Hold
Hold
for f
for f
CK
CK
< 12 MHz
> 12 MHz
6
4
(1)
MSB
5
MSB
and
Figure 26-4 on page 334
Master
Master
Master
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
(2)
7
...
4 • t
2 • t
ATmega164P/324P/644P
...
Min
10
t
20
20
ck
ck
ck
for details.
See
50% duty cycle
2
0.5 • t
Table 16-5
TBD
TBD
Typ
10
10
10
10
15
15
10
LSB
1
sck
LSB
2
3
Max
8
ns
333