ATmega644PA datasheet(336/468 Pages) ATMEL

336 / 468 page

336

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

Figure 27-4. SPI Interface Timing Requirements (Slave Mode)

27.7

2-wire Serial Interface Characteristics

T able 27 -1 2 d e sc r i b e s the re qu ir em en ts f o r d e v i ce s co nn ect ed to the 2 - wire Ser i al Bu s . T h e

ATmega164PA/324PA/644PA/1284P 2-wire Serial Interface meets or exceeds these requirements under the noted

conditions.

Timing symbols refer to Figure 27-5.

MISO

(Data Output)

SCK

(CPOL = 1)

MOSI

(Data Input)

SCK

(CPOL = 0)

MSB

LSB

MSB

...

Table 27-12. 2-wire Serial Bus Requirements

Symbol

Parameter

Condition

Min

Max

Units

Input Low-voltage

-0.5

0.3 V

Input High-voltage

0.7 V

CC + 0.5

Vhys

(1)

Hysteresis of Schmitt Trigger Inputs

0.05 VCC

(2)

–V

(1)

Output Low-voltage

3 mA sink current

0.4

(1)

Rise Time for both SDA and SCL

20 + 0.1C

(2)(3)

300

tof

(1)

Output Fall Time from VIHmin to VILmax

10 pF < Cb < 400 pF

(3)

20 + 0.1Cb

(2)(3)

250

(1)

Spikes Suppressed by Input Filter

50(2)

Input Current each I/O Pin

0.1V

CC < Vi < 0.9VCC

-10

µA

(1)

Capacitance for each I/O Pin

–

SCL

SCL Clock Frequency

(4) > max(16f

SCL, 250kHz)

(5)

400

kHz

Value of Pull-up resistor

SCL ≤ 100 kHz

SCL > 100 kHz

HD;STA

Hold Time (repeated) START Condition

fSCL ≤ 100 kHz

4.0

–

µs

fSCL > 100 kHz

0.6

–

µs

0,4V

–

3mA

----------------------------

1000ns

-------------------

0,4V

–

3mA

----------------------------

300ns

----------------

ATmega644PA Datasheet(PDF) 336 Page - ATMEL Corporation

ATmega644PA Datasheet(HTML) 336 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL