Commit 22c480
2026-03-19 08:24:49 Bob Green: -/-| /dev/null .. programming/examples/pit.md | |
| @@ 0,0 1,66 @@ | |
| + | # PIT |
| + | |
| + | # Duart |
| + | |
| + | ## Definitions |
| + | ### PIT |
| + | #### vasm |
| + | ```asm |
| + | /* PI/T Timer Register Addresses */ |
| + | pit_base equ $af0001 |
| + | |
| + | pit_pgcr equ pit_base |
| + | pit_psrr equ pit_base+2 |
| + | pit_paddr equ pit_base+4 |
| + | pit_pbddr equ pit_base+6 |
| + | pit_pcddr equ pit_base+8 |
| + | pit_pivr equ pit_base+10 |
| + | pit_pacr equ pit_base+12 |
| + | pit_pbcr equ pit_base+14 |
| + | pit_padr equ pit_base+16 |
| + | pit_pbdr equ pit_base+18 |
| + | pit_paar equ pit_base+20 |
| + | pit_pbar equ pit_base+22 |
| + | pit_pcdr equ pit_base+24 |
| + | pit_psr equ pit_base+26 |
| + | |
| + | pit_tcr equ pit_base+32 |
| + | pit_tivr equ pit_base+34 |
| + | pit_cprh equ pit_base+38 |
| + | pit_cprm equ pit_base+40 |
| + | pit_cprl equ pit_base+42 |
| + | pit_cntrh equ pit_base+46 |
| + | pit_cntrm equ pit_base+48 |
| + | pit_cntrl equ pit_base+50 |
| + | pit_tsr equ pit_base+52 |
| + | ``` |
| + | #### gcc |
| + | ```c |
| + | /* PI/T Timer Register Addresses */ |
| + | #define pit_base ((unsigned char*) 0xaf0001) |
| + | |
| + | #define pit_pgcr ((unsigned char*) pit_base) |
| + | #define pit_psrr ((unsigned char*) pit_base+2) |
| + | #define pit_paddr ((unsigned char*) pit_base+4) |
| + | #define pit_pbddr ((unsigned char*) pit_base+6) |
| + | #define pit_pcddr ((unsigned char*) pit_base+8) |
| + | #define pit_pivr ((unsigned char*) pit_base+10) |
| + | #define pit_pacr ((unsigned char*) pit_base+12) |
| + | #define pit_pbcr ((unsigned char*) pit_base+14) |
| + | #define pit_padr ((unsigned char*) pit_base+16) |
| + | #define pit_pbdr ((unsigned char*) pit_base+18) |
| + | #define pit_paar ((unsigned char*) pit_base+20) |
| + | #define pit_pbar ((unsigned char*) pit_base+22) |
| + | #define pit_pcdr ((unsigned char*) pit_base+24) |
| + | #define pit_psr ((unsigned char*) pit_base+26) |
| + | |
| + | #define pit_tcr ((unsigned char*) pit_base+32) |
| + | #define pit_tivr ((unsigned char*) pit_base+34) |
| + | #define pit_cprh ((unsigned char*) pit_base+38) |
| + | #define pit_cprm ((unsigned char*) pit_base+40) |
| + | #define pit_cprl ((unsigned char*) pit_base+42) |
| + | #define pit_cntrh ((unsigned char*) pit_base+46) |
| + | #define pit_cntrm ((unsigned char*) pit_base+48) |
| + | #define pit_cntrl ((unsigned char*) pit_base+50) |
| + | #define pit_tsr ((unsigned char*) pit_base+52) |
| + | ``` |