ATMEGA6450V-8AI(2004) 查看數據表（PDF） - Atmel Corporation

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ATMEGA6450V-8AI
(Rev.:2004)

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

SPI Timing

Characteristics

ATmega325/3250/645/6450

Figure 129. Maximum Frequency vs. VCC (10 - 20 MHz).

16 MHz

8 MHz

Safe Operating Area

2.7V

4.5V

5.5V

See Figure 130 and Figure 131 for details.

Table 124. SPI Timing Parameters

Description

Mode

1

SCK period

Master

2

SCK high/low

Master

3

Rise/Fall time

Master

4

Setup

Master

5

Hold

Master

6

Out to SCK

Master

7

SCK to out

Master

8

SCK to out high

Master

9

SS low to out

Slave

10

SCK period

11

SCK high/low(1)

Slave

Slave

12

Rise/Fall time

Slave

13

Setup

Slave

14

Hold

Slave

15

SCK to out

Slave

16

SCK to SS high

Slave

17

SS high to tri-state

Slave

18

SS low to SCK

Slave

Min

4 • tck

2 • tck

10

tck

20

20 • tck

Typ

Max

See Table 67

50% duty cycle

3.6

10

10

0.5 • tsck

ns

10

10

15

1.6

µs

15

ns

10

Note:

1. In SPI Programming mode the minimum SCK high/low period is:

- 2 tCLCL for fCK < 12 MHz

- 3 tCLCL for fCK > 12 MHz

2570A–AVR–09/04

289

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