M50FW040

36/41

FLOWCHARTS AND PSEUDO CODES

Figure 19. Program Flowchart and Pseudo Code

following the correct command sequence.

2. If an error is found, the Status Register must be cleared before further Program/Erase Controller operations.

Write 40h or 10h

AI03407

Start

Write Address

& Data

Read Status

Register

YES

NO

b7 = 1

YES

NO

b3 = 0

NO

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Program command:

– write 40h or 10h

– write Address & Data

(memory enters read status state after

the Program command)

do:

–read Status Register if Program/Erase

Suspend command given execute

suspend program loop

while b7 = 1

If b3 = 1, VPP invalid error:

– error handler

If b4 = 1, Program error:

– error handler

YES

End

YES

NO

b1 = 0

Program to Protected

Block Error (1, 2)

If b1 = 1, Program to protected block error:

– error handler

Suspend

Suspend

Loop

NO

YES

FWH

Interface

Only