m37516e6hp Renesas Electronics Corporation., m37516e6hp Datasheet - Page 57

• Manufacturer Part Number: m37516e6hp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Renesas Electronics Corporation.

7516 Group
By writing the command code “20
confirmation command code “20
follows, the operation of erase all blocks (erase and erase verify)
starts.
Whether the erase all blocks command is terminated can be con-
firmed by reading the status register or the RY/BY Status Flag of
flash memory control register. When the erase all blocks operation
starts, the read status register mode is entered automatically and
the contents of the status register can be read out at the data bus
(D
time the erase operation starts and is returned to “1” upon comple-
tion of the erase operation. In this case, the read status register
mode remains active until another command is written.
The RY/BY Status Flag is “0” during erase operation and “1” when
the erase operation is completed as is the status register bit 7
(SR7).
After the erase all blocks end, erase results can be checked by
reading bit 5 (SRS) of the status register. For details, refer to the
section where the status register is detailed.
By writing the command code “20
confirmation command code “D0
second bus cycle that follows, the block erase (erase and erase
verify) operation starts for the block address of the flash memory
to be specified.
Whether the block erase operation is completed can be confirmed
by reading the status register or the RY/BY Status Flag of flash
memory control register. At the same time the block erase opera-
tion starts, the read status register mode is automatically entered,
so that the contents of the status register can be read out. The
status register bit 7 (SR7) is set to “0” at the same time the block
erase operation starts and is returned to “1” upon completion of
the block erase operation. In this case, the read status register
mode remains active until the read array command (FF
ten.
The RY/BY Status Flag is “0” during block erase operation and “1”
when the block erase operation is completed as is the status reg-
ister bit 7.
After the block erase ends, erase results can be checked by read-
ing bit 5 (SRS) of the status register. For details, refer to the
section where the status register is detailed.
Rev.1.01
Erase All Blocks Command (20
Block Erase Command (20
0
to D
7
____
____
). The status register bit 7 (SR7) is set to “0” at the same
Jul 01, 2003
page 55 of 89
16
/D0
16
16
16
16
16
” in the second bus cycle that
” and the blobk address in the
16
” in the first bus cycle and the
” in the first bus cycle and the
/20
)
16
)
____
____
16
) is writ-
Fig. 61 Erase flowchart
Write
( R e a d c o m a n d “ F F
E r a s e c o m p l e t e d
S t a t u s r e g i s t e r
RY/BY = 1 ?
SR5 = 0 ?
W r i t e 2 0
SR7 = 1 ?
B l o c k a d d r e s s
w r i t e )
S t a r t
r e a d
2 0
or
1 6
Y E S
Y E S
/ D 0
1 6
1 6
1 6
”
N O
N O
2 0
D 0
1 6
1 6
: E r a s e a l l b l o c k s c o m m a n d
: B l o c k e r a s e c o m m a n d
E r a s e e r r o r