UPD78F9234MC-5A4-A Datasheet, PDF (293/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 19 FLASH MEMORY
(7) Flash write buffer register (FLW)
This register is used to store the data to be written to the flash memory.
This register is set with a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears these registers to 00H.
Figure 19-16. Format of Flash Write Buffer Register (FLW)
Address: FFA8H After reset: 00H R/W
Symbol
7
6
5
4
FLW
FLW7
FLW6
FLW5
FLW4
3
FLW3
2
FLW2
1
FLW1
0
FLW0
(8) Protect byte
This protect byte is used to specify the area that is to be protected from writing or erasing. The specified area
is valid only in the self programming mode. Because self programming of the protected area is invalid, the data
written to the protected area is guaranteed.
Figure 19-17. Format of Protect Byte (1/2)
Address: 0081H
7
6
5
4
3
2
1
0
1
PRSELF4 PRSELF3 PRSELF2 PRSELF1 PRSELF0
1
1
• μPD78F9232
PRSELF4 PRSELF3
0
1
0
1
PRSELF2
0
0
PRSELF1
0
0
0
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
1
1
1
1
Other than above
PRSELF0
0
1
0
1
0
1
0
1
1
Status
Blocks 15 to 0 are protected.
Blocks 13 to 0 are protected.
Blocks 14 and 15 can be written or erased.
Blocks 11 to 0 are protected.
Blocks 12 to 15 can be written or erased.
Blocks 9 to 0 are protected.
Blocks 10 to 15 can be written or erased.
Blocks 7 to 0 are protected.
Blocks 8 to 15 can be written or erased.
Blocks 5 to 0 are protected.
Blocks 6 to 15 can be written or erased.
Blocks 3 to 0 are protected.
Blocks 4 to 15 can be written or erased.
Blocks 1 and 0 are protected.
Blocks 2 to 15 can be written or erased.
All blocks can be written or erased.
Setting prohibited
User’s Manual U17446EJ5V0UD
291