AT91SAM7S64C-AU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT91SAM7S64C-AU

AT91SAM ARM-based Flash MCU

Atmel Corporation 

Table 20-5. Read Handshake

Step

Programmer Action

1

Sets MODE and DATA signals

2

Clears NCMD signal

3

Waits for RDY low

4

Sets DATA signal in tristate

5

Clears NOE signal

6

Waits for NVALID low

7

8

Reads value on DATA Bus

9

Sets NOE signal

10

Waits for NVALID high

11

Sets DATA in output mode

12

Sets NCMD signal

13

Waits for RDY high

Device Action

Waits for NCMD low

Latch MODE and DATA

Clears RDY signal

Waits for NOE Low

Sets DATA bus in output mode and outputs the

flash contents.

Clears NVALID signal

Waits for NOE high

Sets DATA bus in input mode

Sets NVALID signal

Waits for NCMD high

Sets RDY signal

DATA I/O

Input

Input

Input

Input

Tristate

Output

Output

Output

Output

X

Input

Input

Input

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

129

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