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README.md: update

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Peter McGoron 2023-02-12 20:45:51 +00:00
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@ -13,15 +13,20 @@ suceeding pseudo-UTF-8 character is encoded as follows:
* `1111110H 10HHHxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx` * `1111110H 10HHHxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx`
* `11111110 10HHHHxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx` * `11111110 10HHHHxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx`
The first four bytes determine the type: The first four bytes determine the type. The LSB high bit determines
if the encoded value is a register (`0001`) or immediate (`0010`).
* `0`: Value is a register. The second bit from LSB determines if the value should be treated
* `1`: Value is immediate. as a signed 32 bit two's compliment number (`001X`) or should be
treated as an unsigned 32 bit number (`000X`).
All other values are reserved. Overlong values are allowed, and for some All other values are reserved. Overlong values are allowed, and for some
argument values they are necessary. All lines are terminated by a byte argument values they are necessary. All lines are terminated by a byte
of all zeros. of all zeros.
## Assembler
The macro assembler is Python (see the asm directory).
## Design Philsophy ## Design Philsophy
Creole is small but not minimal. It is easy to add instructions, and Creole is small but not minimal. It is easy to add instructions, and