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參數(shù)資料
| 型號： | TLV5614IYZT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, UUC16 |
| 封裝： | GREEN, DIE-16 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 500K |
| 代理商： | TLV5614IYZT |
www.ti.com
SBAS401 – DECEMBER 2006
out temp, SSPCR; reset transmitter
splk #0002Eh, temp
out temp,SSPCR
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; reset the rolling pointer
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
lacl #000h
sacl r_ptr
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; enable interrupts
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
clrc INTM ; enable maskable interrupts
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; loop forever!
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
next idle ;wait for interrupt
b next
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
;all else fails stop here
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
done b done ;hang there
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Interrupt Service Routines
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
int1 ret ; do nothing and return
int23 ret ; do nothing and return
timer_isr:
in iosr_stat, IOSR; store IOSR value into variable space
lacl iosr_stat ; load acc with iosr status
and #0FFFDh ; reset IO1 - LDAC low
sacl temp ;
out temp, IOSR;
or #0002h ; set IO1 - LDAC high
sacl temp ;
out temp, IOSR;
and #0FFFEh ; reset IO0 - CS low
sacl temp ;
out temp, IOSR;
lacl r_ptr ; load rolling pointer to accumulator
add #sinevals ; add pointer to table start
sacl DACa_ptr ; to get a pointer for next DAC a sample
add #08h ; add 8 to get to DAC C pointer
sacl DACc_ptr
add #08h ; add 8 to get to DAC B pointer
sacl DACb_ptr
add #08h ; add 8 to get to DAC D pointer
sacl DACd_ptr
mar *,ar0 ; set ar0 as current AR
; DAC A
lar ar0, DACa_ptr ; ar0 points to DAC a sample
lacl * ; get DAC a sample into accumulator
or #DACa_control ; OR in DAC A control bits
sacl temp ;
out temp, SDTR; send data
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––;
We must wait for transmission to complete before writing next word to the SDTR.;
TLV5614/04 interface does not allow the use of burst mode with the full packet; rate, as
we need a CLKX -ve edge to clock in last bit before FS goes high again,; to allow SPI
compatibility.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
rpt #016h ; wait long enough for this configuration
nop ; of MCLK/CLKOUT1 rate
; DAC B
lar ar0, dacb_ptr ; ar0 points to DAC a sample
lacl * ; get DAC a sample into accumulator
or #DACb_control ; OR in DAC B control bits
sacl temp ;
out temp, SDTR; send data
rpt #016h ; wait long enough for this configuration
nop ; of MCLK/CLKOUT1 rate
; DAC C
lar ar0, dacc_ptr ; ar0 points to dac a sample
16
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