ST ST7 - Page 214

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7 - Debugger and PROM Programmer Tutorial for ST72251
AddrTasks:
DC.W Task1, Task2, Task3, Task4
; Table of pulse duration. Returns the result of the voltage to period
function.
TimingTable:
DC.B 100, 93, 87, 82, 77, 73, 69, 66
DC.B 63, 60, 57, 55, 53, 51, 49, 47
DC.B 46, 44, 43, 41, 40, 39, 38, 37
DC.B 36, 35, 34, 33, 32, 32, 31, 30
DC.B 30, 29, 28, 28, 27, 27, 26, 26
DC.B 25, 25, 24, 24, 23, 23, 23, 22
DC.B 22, 22, 21, 21, 21, 20, 20, 20
DC.B 19, 19, 19, 19, 18, 18, 18, 18
DC.B 17, 17, 17, 17, 16, 16, 16, 16
DC.B 16, 16, 15, 15, 15, 15, 15, 15
DC.B 14, 14, 14, 14, 14, 14, 13, 13
DC.B 13, 13, 13, 13, 13, 13, 12, 12
DC.B 12, 12, 12, 12, 12, 12, 12, 12
DC.B 11, 11, 11, 11, 11, 11, 11, 11
DC.B 11, 11, 11, 10, 10, 10, 10, 10
DC.B 10, 10, 10, 10, 10, 10, 10, 10
DC.B 09, 09, 09, 09, 09, 09, 09, 09
DC.B 09, 09, 09, 09, 09, 09, 09, 09
DC.B 09, 08, 08, 08, 08, 08, 08, 08
DC.B 08, 08, 08, 08, 08, 08, 08, 08
DC.B 08, 08, 08, 08, 08, 08, 08, 07
DC.B 07, 07, 07, 07, 07, 07, 07, 07
DC.B 07, 07, 07, 07, 07, 07, 07, 07
DC.B 07, 07, 07, 07, 07, 07, 07, 07
DC.B 07, 07, 07, 06, 06, 06, 06, 06
DC.B 06, 06, 06, 06, 06, 06, 06, 06
DC.B 06, 06, 06, 06, 06, 06, 06, 06
DC.B 06, 06, 06, 06, 06, 06, 06, 06
DC.B 05, 05, 05, 05, 05, 05, 05, 05
DC.B 05, 05, 05, 05, 05, 05, 05, 05
DC.B 05, 05, 05, 05, 05, 05, 05, 05
; Initialization
; ==============
reset:
ld A, #cpudiv2 ; CPU clock prescaler
ld miscr, A ; CPU clock=4Mhz
ld A, #watch ; Load the watchdog
ld wdgr, A
ld A, #$FF ; Port A open drain
ld paddr, A
clr paor
ld padr, A ; leds off
ld A, #$40 ; Initialize the timer
ld tacr1, A ; Enable interrupt
ld A, #8 ; on compare
ld tacr2, A ; Prescaler 1/8