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1ac0eb Bob Green 2026-03-19 08:22:37
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# Duart
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## Definitions
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### PIT
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```asm
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/* PI/T Timer Register Addresses */
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pit_base equ $af0001
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pit_pgcr equ pit_base
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pit_psrr equ pit_base+2
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pit_paddr equ pit_base+4
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pit_pbddr equ pit_base+6
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pit_pcddr equ pit_base+8
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pit_pivr equ pit_base+10
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pit_pacr equ pit_base+12
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pit_pbcr equ pit_base+14
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pit_padr equ pit_base+16
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pit_pbdr equ pit_base+18
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pit_paar equ pit_base+20
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pit_pbar equ pit_base+22
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pit_pcdr equ pit_base+24
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pit_psr equ pit_base+26
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pit_tcr equ pit_base+32
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pit_tivr equ pit_base+34
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pit_cprh equ pit_base+38
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pit_cprm equ pit_base+40
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pit_cprl equ pit_base+42
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pit_cntrh equ pit_base+46
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pit_cntrm equ pit_base+48
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pit_cntrl equ pit_base+50
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pit_tsr equ pit_base+52
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```
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```c
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/* PI/T Timer Register Addresses */
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#define pit_base ((unsigned char*) 0xaf0001)
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#define pit_pgcr ((unsigned char*) pit_base)
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#define pit_psrr ((unsigned char*) pit_base+2)
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#define pit_paddr ((unsigned char*) pit_base+4)
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#define pit_pbddr ((unsigned char*) pit_base+6)
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#define pit_pcddr ((unsigned char*) pit_base+8)
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#define pit_pivr ((unsigned char*) pit_base+10)
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#define pit_pacr ((unsigned char*) pit_base+12)
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#define pit_pbcr ((unsigned char*) pit_base+14)
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#define pit_padr ((unsigned char*) pit_base+16)
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#define pit_pbdr ((unsigned char*) pit_base+18)
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#define pit_paar ((unsigned char*) pit_base+20)
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#define pit_pbar ((unsigned char*) pit_base+22)
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#define pit_pcdr ((unsigned char*) pit_base+24)
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#define pit_psr ((unsigned char*) pit_base+26)
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#define pit_tcr ((unsigned char*) pit_base+32)
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#define pit_tivr ((unsigned char*) pit_base+34)
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#define pit_cprh ((unsigned char*) pit_base+38)
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#define pit_cprm ((unsigned char*) pit_base+40)
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#define pit_cprl ((unsigned char*) pit_base+42)
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#define pit_cntrh ((unsigned char*) pit_base+46)
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#define pit_cntrm ((unsigned char*) pit_base+48)
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#define pit_cntrl ((unsigned char*) pit_base+50)
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#define pit_tsr ((unsigned char*) pit_base+52)
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```