| Rev |
Log message |
Author |
Age |
Path |
| 188 |
Added a generic to alter the behavior of RTI so that it can optionally skip restoring the general purpose flags GP4 to GP7, allowing ISR's to make persistent changes to them. Also exported these flags to the top level for use outside the CPU. |
jshamlet |
1582d 12h |
/ |
| 187 |
Added the CPU_Halt input, only now as an input to the instruction decoder. The CPU_Halt line will assert the registered CPU_Halt_Req, which will cause the instruction decoder to abort the current instruction, reset the PC, then enter a hold state until the line is deasserted. Additionally, a very minor bug that could cause the SMSK instruction to effectively execute twice if interrupted was fixed. Lastly, cleaned up the comments even more. |
jshamlet |
1584d 09h |
/ |
| 186 |
Merged the interrupt override logic into the case structure, simplifying how interrupts are processed. |
jshamlet |
1587d 08h |
/ |
| 185 |
1) Fixed an apparently long-standing bug where the interrupt bit wasn't being cleared after an RTI
2) Modified the program counter logic to be simpler. It now always increments, and states control the increment using the offset field. A new set of constants was added to replace the old states.
3) Modified the ALU to always use Operand1 instead of ALU_Ctrl.Data (and removed the field in the record). A new ALU command, ALU_GMSK, was added, as it was the only instruction to set the .Data field to something other than Operand1 (Int_Mask)
4) Modified the package file so that flag names match what the assembler calls them. FL_Z is now PSR_Z, FL_GP1 is now PSR_GP4, etc.
5) Cleaned up the comments and code formatting |
jshamlet |
1587d 11h |
/ |
| 184 |
More file/entity renaming to match private versions. |
jshamlet |
1589d 11h |
/ |
| 183 |
Renamed core to o8_cpu to match new naming scheme |
jshamlet |
1589d 11h |
/ |
| 182 |
Simplified the address generation logic at the expense of making LDX take one additional clock cycle. This allowed the address logic to be split out of the main state machine and simplified (greatly). During this process, a bug in SDO was found and fixed that caused it to return through the wrong pipe fill state wnen auto increment was disabled. |
jshamlet |
1589d 11h |
/ |
| 181 |
Altered the RSP instruction to allow the stack pointed to either be restored from registers or stored to registers based on the status of a processor bit. Also modified LDX to simplify the address logic. |
jshamlet |
1590d 08h |
/ |
| 180 |
Added additional Open8 compatible modules |
jshamlet |
1594d 11h |
/ |
| 179 |
Replacing files accidentally deleted during check-in |
jshamlet |
1604d 07h |
/ |
| 178 |
Adding Open8 toolset for pure assembly |
jshamlet |
1604d 07h |
/ |
| 177 |
Fixed comments in RTC module |
jshamlet |
2914d 12h |
/ |
| 176 |
Fixed documentation errors,
Modified uSec_Tick such that it is always generated regardless of the interval. |
jshamlet |
2919d 09h |
/ |
| 175 |
Added 4 and 8-bit LCD interfaces with backlight and contrast DACs |
jshamlet |
2919d 14h |
/ |
| 174 |
Added ROM/RAM wrappers |
jshamlet |
3114d 09h |
/ |
| 173 |
Added a couple of useful interfaces for detecting button presses and clock changes. |
jshamlet |
3114d 09h |
/ |
| 172 |
General code cleanup |
jshamlet |
3114d 09h |
/ |
| 171 |
Fixed comments for offsets 0x0 - 0x3 to indicate the read value |
jshamlet |
3114d 09h |
/ |
| 170 |
Added 24-bit resolution epoch timer / alarm clock |
jshamlet |
3114d 09h |
/ |
| 169 |
Corrected issue with CMP and SBC generating an inverted carry flag and added new constants to the package file to simplify interfacing new modules. |
jshamlet |
3169d 10h |
/ |
