31.10.10 Programming Command Register
The Programming Command Register is a 15-bit register. This register is used to serially shift in programming commands, and to serially shift out the result of the previous command, if any. The JTAG Programming Instruction Set is shown in the following table. The state sequence when shifting in the programming commands is illustrated in State Machine Sequence for Changing/Reading the Data Word further down in this section.
| Instruction | TDI sequence | TDO sequence | Notes |
|---|---|---|---|
| 1a. Chip erase | 0100011_10000000 0110001_10000000 0110011_10000000 0110011_10000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | |
| 1b. Poll for chip erase complete | 0110011_10000000 | xxxxxox_xxxxxxxx | (2) |
| 2a. Enter Flash Write | 0100011_00010000 | xxxxxxx_xxxxxxxx | |
| 2b. Load Address High Byte | 0000111_aaaaaaaa | xxxxxxx_xxxxxxxx | (9) |
| 2c. Load Address Low Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 2d. Load Data Low Byte | 0010011_iiiiiiii | xxxxxxx_xxxxxxxx | |
| 2e. Load Data High Byte | 0010111_iiiiiiii | xxxxxxx_xxxxxxxx | |
| 2f. Latch Data | 0110111_00000000 1110111_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 2g. Write Flash Page | 0110111_00000000 0110101_00000000 0110111_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 2h. Poll for Page Write complete | 0110111_00000000 | xxxxxox_xxxxxxxx | (2) |
| 3a. Enter Flash Read | 0100011_00000010 | xxxxxxx_xxxxxxxx | |
| 3b. Load Address High Byte | 0000111_aaaaaaaa | xxxxxxx_xxxxxxxx | (9) |
| 3c. Load Address Low Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 3d. Read Data Low and High Byte | 0110010_00000000 0110110_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo xxxxxxx_oooooooo | low
byte high byte |
| 4a. Enter EEPROM Write | 0100011_00010001 | xxxxxxx_xxxxxxxx | |
| 4b. Load Address High Byte | 0000111_aaaaaaaa | xxxxxxx_xxxxxxxx | (9) |
| 4c. Load Address Low Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 4d. Load Data Byte | 0010011_iiiiiiii | xxxxxxx_xxxxxxxx | |
| 4e. Latch Data | 0110111_00000000 1110111_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 4f. Write EEPROM Page | 0110011_00000000 0110001_00000000 0110011_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 4g. Poll for Page Write complete | 0110011_00000000 | xxxxxox_xxxxxxxx | (2) |
| 5a. Enter EEPROM Read | 0100011_00000011 | xxxxxxx_xxxxxxxx | |
| 5b. Load Address High Byte | 0000111_aaaaaaaa | xxxxxxx_xxxxxxxx | (9) |
| 5c. Load Address Low Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 5d. Read Data Byte | 0110011_bbbbbbbb 0110010_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 6a. Enter Fuse Write | 0100011_01000000 | xxxxxxx_xxxxxxxx | |
| 6b. Load Data Low Byte(6) | 0010011_iiiiiiii | xxxxxxx_xxxxxxxx | (3) |
| 6c. Write Fuse Extended byte | 0111011_00000000 0111001_00000000 0111011_00000000 0111011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 6d. Poll for Fuse Write complete | 0110111_00000000 | xxxxxox_xxxxxxxx | (2) |
| 6e. Load Data Low Byte(7) | 0010011_iiiiiiii | xxxxxxx_xxxxxxxx | (3) |
| 6f. Write Fuse High byte | 0110111_00000000 0110101_00000000 0110111_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 6g. Poll for Fuse Write complete | 0110111_00000000 | xxxxxox_xxxxxxxx | (2) |
| 6h. Load Data Low Byte(7) | 0010011_iiiiiiii | xxxxxxx_xxxxxxxx | (3) |
| 6i. Write Fuse Low byte | 0110011_00000000 0110001_00000000 0110011_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 6j. Poll for Fuse Write complete | 0110011_00000000 | xxxxxox_xxxxxxxx | (2) |
| 7a. Enter Lock bit Write | 0100011_00100000 | xxxxxxx_xxxxxxxx | |
| 7b. Load Data Byte(9) | 0010011_11iiiiii | xxxxxxx_xxxxxxxx | (4) |
| 7c. Write Lock bits | 0110011_00000000 0110001_00000000 0110011_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx | (1) |
| 7d. Poll for Lock bit Write complete | 0110011_00000000 | xxxxxox_xxxxxxxx | (2) |
| 8a. Enter Fuse/Lock bit Read | 0100011_00000100 | xxxxxxx_xxxxxxxx | |
| 8b. Read Extended Fuse Byte(6) | 0111010_00000000 0111011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 8c. Read Fuse High Byte(7) | 0111110_00000000 0111111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 8d. Read Fuse Low Byte(8) | 0110010_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 8e. Read Lock bits(9) | 0110110_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxoooooo | (5) |
| 8f. Read Fuses and Lock bits | 0111010_00000000 0111110_00000000 0110010_00000000 0110110_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo xxxxxxx_oooooooo xxxxxxx_oooooooo xxxxxxx_oooooooo | (5) fuse ext. byte fuse high byte fuse low byte lock bits |
| 9a. Enter Signature Byte Read | 0100011_00001000 | xxxxxxx_xxxxxxxx | |
| 9b. Load Address Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 9c. Read Signature Byte | 0110010_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 10a. Enter Calibration Byte Read | 0100011_00001000 | xxxxxxx_xxxxxxxx | |
| 10b. Load Address Byte | 0000011_bbbbbbbb | xxxxxxx_xxxxxxxx | |
| 10c. Read Calibration Byte | 0110110_00000000 0110111_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_oooooooo | |
| 11a. Load No Operation Command | 0100011_00000000 0110011_00000000 | xxxxxxx_xxxxxxxx xxxxxxx_xxxxxxxx |
- This command sequence is not required if the seven MSB are correctly set by the previous command sequence (which is normally the case).
- Repeat until o = “1”.
- Set bits to “0” to program the corresponding fuse, “1” to unprogram the Fuse.
- Set bits to “0” to program the corresponding lock bit, “1” to leave the Lock bit unchanged.
- “0” = programmed, “1” = unprogrammed.
- The bit mapping for Fuses Extended byte is listed in Extended Fuse Byte table of Fuse Bits section.
- The bit mapping for Fuses High byte is listed in Fuse High Byte table of Fuse Bits section.
- The bit mapping for Fuses Low byte is listed in Fuse Low Byte table of Fuse Bits section.
- The bit mapping for Lock bits byte is listed in Lock Bit Byte table of Program and Data Memory Lock Bits section.
- Address bits exceeding PCMSB and EEAMSB (Command Byte Bit Coding in Signal Names section and Page Size section) are don’t care
