Datasheet

Figure 24.TMS320 Assembly Language Program to Control Conversions Using the TMS320 Simple Serial Interface (continued)

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LDI *+AR0 (80), R2 ; Read in Serial Ch 1 global register

AND 01H, R2 ; Check for RRDY Active (1)

; RRDY goes active when 16-bits have been rcvd

BZ wait_sample ; Keep waiting if not ready

LDI *+AR0 (92), R3 ; Ready, read value from Data Receive register

STI R3, *+AR1 (0) ; Send out value to host

LDI 100, R0

SUB1 1, R0

BNZ wait_loop ; Keep waiting until R0 decremented to zero

BR @next_sample ; Go start next convert

wait_sample

;

; wait for completion of conversion

; MAX121 SFRM Active signals TMS320 FSR1 that data transfer

; is ready to start.

;

; Arbitrary wait time until start of next convert.

;

wait_loop:

.end

MAX121 308ksps ADC with DSP Interface and 78dB SINAD

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