Texas Instruments TMS320C3 Series, User Manual, Page: 56 / 166

TLC32040 AIC Initialization
4-22
Example 4–2.Setting the TA and TB Registers (Continued)
;======================================================;
; This section of code initializes the AIC ;
;======================================================;
AIC_INIT LDI
0x10,IE ; Enable only XINT interrupt
andn 0x34,IF ;
ldi 0,R0 ;
sti R0,@S0_xdata ;
RPTS 0x040 ;
LDI 2,IOF ; XF0=0 resets AIC
rpts 0x40 ;
LDI 6,IOF ; XF0=1 runs AIC
;–––––––––––––––––––––
ldi @C_REG,R0 ; Setup control register
call prog_AIC ;
ldi 0xfffc ,R0 ; Program the AIC to be real slow
call prog_AIC ;
ldi 0xfffc|2,R0 ;
call prog_AIC ;
ldi @B_REG,R0 ; Bump up the Fs to final rate
call prog_AIC ; (smallest divisor should be last)
ldi @A_REG,R0 ;
call prog_AIC ;
b main
;–––––––––––––––––––––––––––––––
prog_AIC
ldi @S0_xdata,R1 ; Use original DXR data during 2 ndy
sti R1,@S0_xdata ;
idle
ldi @S0_xdata,R1 ; Use original DXR data during 2 ndy
or 3,R1 ; Request 2 ndy XMIT
sti R1,@S0_xdata ;
idle ;
sti R0,@S0_xdata ; Send register value
idle ;
andn 3,R1 ;
sti R1,@S0_xdata ; Leave with original safe value in DXR
;–––––––––––––––––––––
ldi @S0_rdata,R0 ; Fix the receiver underrun by reading
rets main ; the DRR before going to the main loop
;****************************************************;
; Install the XINT/RINT ISR handler directly into ;
; the vector RAM location it will be used for ;
;****************************************************;
.start ”SP0VECTS”,0x809FC5
.sect ”SP0VECTS”
B DAC2 ; XINT0
B ADC2 ; RINT0