Flash OTP area read mode
1. Enter OCD (=ISP) mode.
2. Set ENBDM bit of BCR.
3. Enable debug and Request debug mode.
4. Select OTP area. FEMR:1000_0101
5. Read data from Flash.
Flash OTP area 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 and select OTP area. FEMR:1010_0101
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.
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