I want to control both frequency and amplitude at short time.
It's too slow to control with serial port for my application,
so, I want to use AD9910 both control frequency and amplitude with parallel port.
DRG,RAM,OSK, is OFF, and
Data assembler hold last value is ON
Is following method available ?
(0) TX_ENABLE =1
(1-1) F[1:0] select FREQUENCY
(1-2) D[15:0] set FTW value
(2) wait for some clocks for FTW valid
(3) F[1:0] select AMPLITUDE
(4) D[15:0] set AMPLITUDE-high value
(5) wait for some clocks for modulation rate
(6) D[15:0] set AMPLITUDE-low value
and so on...(varies AMPLITUDE ONLY)
I'm afraid that the supplied FTW value vanishes with F[1:0] change...
Thanks in advance for your help