
19. Memory programming
A96G166/A96A166/A96S166 User’s manual
192
B.
Write 0x55 to 0xFAAA.
C.
Write 0xA5 to 0xF555.
NOTES
:
1.
Refer to how to enter ISP mode.
2.
Command sequence to activate Flash write/erase mode. It is composed of sequentially writing
data of Flash memory.
Flash write mode
1.
Enable program mode.
2.
Reset page buffer. FEMR: 1000_0001 FECR:0000_0010
3.
Select page buffer. FEMR:1000_1001
4.
Write data to page buffer (Address automatically increases by twin).
5.
Set write mode. FEMR:1010_0001
6.
Set page address. FEARH:FEARM:FEARL=20’hx_xxxx
7.
Set FETCR.
8.
Start program. FECR:0000_1011
9.
Insert one NOP operation
10.
Read FESR until PEVBSY is 1.
11.
Repeat 2 to
8
until all pages are written.
Flash page erase mode
1.
Enable program mode.
2.
Reset page buffer. FEMR: 1000_0001 FECR:0000_0010
3.
Select page buffer. FEMR:1000_1001
4.
Write ‘h00 to page buffer. (Data value is not important.)
5.
Set erase mode. FEMR:1001_0001
6.
Set page address. FEARH:FEARM:FEARL=20’hx_xxxx
7.
Set FETCR.
8.
Start erase. FECR:0000_1011
9.
Insert one NOP operation
10.
Read FESR until PEVBSY is 1.