45/52

M50FLW040A, M50FLW040B

Figure 23. Double/Quadruple Byte Program Flowchart and Pseudo code (FWH Mode Only)

command sequence.

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

3. A0 and/or A1 are treated as Don’t Care (A0 for Double Byte Program and A1-A0 for Quadruple Byte Program).

For Double Byte Program: Starting at the Start Address, the first data Byte is programmed at the even address, and the second at

the odd address.

For Quadruple Byte Program: Starting at the Start Address, the first data Byte is programmed at the address that has A1-A0 at 00,

the second at the address that has A1-A0 at 01, the third at the address that has A1-A0 at 10, and the fourth at the address that

has A1-A0 at 11.

AI08423B

Read Status

Register

YES

NO

SR7 = 1

YES

NO

SR3 = 0

NO

SR4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Double/Quadruple Byte Program command:

– write 40h or 10h

– write Start Address and 2/4 Data Bytes (3)

(memory enters read status state after

the Double/Quadruple Byte Program command)

do:

– Read Status Register

– If SR7=0 and a Program/Erase Suspend

command has been executed

– SR7 is set to 1

– Enter suspend program loop

If SR3 = 1, VPP invalid error:

– error handler

If SR4 = 1, Program error:

– error handler

Suspend

Suspend

Loop

NO

YES

Write 40h or 10h

Start

Write Start Address

and 2/4 Data Bytes (3)

YES

End

YES

NO

SR1 = 0

Program to Protected

Block Error (1, 2)

If SR1 = 1,

Program to protected block error:

– error handler