Difference between revisions of "84PCE:OS:Serial Flash Commands"
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(Created page with "Serial Flash Commands The Python Edition calculator contains a new serial flash chip with an entirely new interface. For pre-Py...") |
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=== Erasing === | === Erasing === | ||
<pre> | <pre> | ||
| − | 00000000 00000001 00000000 02000006 | + | 00000000 00000001 00000000 02000006 |
| − | XXXXXXXX 03000001 00000000 020000D8 | + | XXXXXXXX 03000001 00000000 020000D8 |
| − | 00000000 00000001 00000000 04000005 | + | 00000000 00000001 00000000 04000005 |
</pre> | </pre> | ||
| + | X is the address of the block to erase. | ||
=== Writing === | === Writing === | ||
| Line 18: | Line 19: | ||
<pre> | <pre> | ||
| − | 00000000 00000001 00000000 02000006 | + | 00000000 00000001 00000000 02000006 |
| − | XXXXXXXX 03000001 YYYYYYYY 42000032 | + | XXXXXXXX 03000001 YYYYYYYY 42000032 |
| − | + | ||
</pre> | </pre> | ||
| + | X is the address to write to, Y is the number of bytes to write (maximum 256). | ||
| + | Afterwards, write each byte to $E00900, followed by a normal wait. | ||
Revision as of 23:50, 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 (maximum 256). Afterwards, write each byte to $E00900, followed by a normal wait.
