AT91SAM7S64C-AU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT91SAM7S64C-AU

AT91SAM ARM-based Flash MCU

Atmel Corporation 

Figure 19-5. Command State Chart

Read Status: MC_FSR

No

Check if FRDY flag set

Yes

Write FCMD and PAGENB in MC_FCR

Read Status: MC_FSR

No

Check if FRDY flag set

Yes

Yes

Check if LOCKE flag set

Locking region violation

No

Yes

Check if PROGE flag set

Bad keyword violation and/or Invalid command

No

Command Successful

In order to guarantee valid operations on the Flash memory, the field Flash Microsecond Cycle Number (FMCN) in

the Flash Mode Register MC_FMR must be correctly programmed (see “MC Flash Mode Register” on page 115).

19.2.4.1 Flash Programming

Several commands can be used to program the Flash.

The Flash technology requires that an erase must be done before programming. The entire memory plane can be

erased at the same time, or a page can be automatically erased by clearing the NEBP bit in the MC_FMR register

before writing the command in the MC_FCR register.

By setting the NEBP bit in the MC_FMR register, a page can be programmed in several steps if it has been erased

before (see Figure 19-6).

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

110

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