Difference between revisions of "84PCE:OS:Serial Flash Commands"
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X is the address to write to. | X is the address to write to. | ||
| − | Y is the number of bytes to write | + | Y is the number of bytes to write, at most the number of bytes remaining in the page. |
Afterwards, write each byte to $E00900, followed by a normal wait. | Afterwards, write each byte to $E00900, followed by a normal wait. | ||
Revision as of 23:51, 29 June 2019
The Python Edition calculator contains a new serial flash chip with an entirely new interface. For pre-Python calculators see the old parallel interface.
For reference, pages are 256 bytes, sectors are 4KB, and blocks are 64KB.
Basic Flash Commands
You write a command to the range $E00800-$E0080F and then wait until $E00824 bit 0 is set at which point you acknowledge by setting the same bit.
Erasing
00000000 00000001 00000000 02000006 XXXXXXXX 03000001 00000000 020000D8 00000000 00000001 00000000 04000005
X is the address of the block to erase.
Writing
Writes can only happen within a single page at a time.
00000000 00000001 00000000 02000006 XXXXXXXX 03000001 YYYYYYYY 42000032
X is the address to write to.
Y is the number of bytes to write, at most the number of bytes remaining in the page.
Afterwards, write each byte to $E00900, followed by a normal wait.
