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參數(shù)資料
| 型號： | LTC1402C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Serial 12-Bit, 2.2Msps Sampling ADC with Shutdown |
| 中文描述： | 串行12位，2.2Msps采樣ADC，帶有關(guān)斷 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 251K |
| 代理商： | LTC1402C |
18
LTC1402
APPLICATIO
S I
FOR
ATIO
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; ————————Buffered Receive Interrupt Routine —————————
breceive:
ifr = #10h
; clear interrupt flags
TC = bitf(@BSPCE,#4000h)
; check which half (bspce(bit14)) of buffer
if (NTC) goto bufull
; if this still the first half get next half
bspce = #(2023h + 08000h)
; turn on halt for second half (bspce(bit15))
return_enable
; ———————mask and shift input data after 2k buffer is full——-
bufull:
b = *ar3+ << -2
; load acc b with BSP buffer and shift right 2
b = #00FFFh & b
; mask out the REF bit and the 3 other tristate bits
b = #00800h ^ b
; invert BIPOLAR MSB. Comment this line in UNIPOLAR mode
*ar2+ = data(#0bh)
; store B to out buffer and advance AR2 pointer
TC = (@ar2 == #02000h) ; output buffer is 2k starting at 1800h
if (TC) goto start
; restart if out buffer is at 1fffh
goto bufull
; —————————dummy bsend return————————————
bsend return_enable
;this is a dummy return to define bsend
;in vector table below
; ——————————— end ISR ——————————————
;initialize buffered serial port
**********************************************************************
* BSP initialization code for the ‘C54x DSKplus
* for use with 1402 in standard mode
* BSPC and SPC are the same in the ‘C542
**********************************************************************
ON
.set 1
OFF
.set !ON
YES
.set 1
NO
.set !YES
BIT_8
.set 2
BIT_10
.set 1
BIT_12
.set 3
BIT_16
.set 0
GO
.set 0x80
**********************************************************************
* This is an example of how to initialize the Buffered Serial Port (BSP).
* The BSP is initialized to require an external CLK and FSX for
* operation. The data format is 16-bits, burst mode, with autobuffering
* enabled.
*
*
*****************************************************************************************************
*Timing at BSP pins in DSKPLUS TMS320c542 board with inverters at BCLKR and BFSR.
*BFSR Pin JP1-20 ~\___/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\___/~~~~~~~~~~*
*BCLKR Pin JP1-14 _/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/~\_/
*BDR Pin JP1-26 -_—_—<REF-B11-B10-B09-B08-B07-B06-B05-B04-B03-B02-B01-B00>—_—_—<REF-B11-
*CLKIN Pin JP5-09 ~~~~~\_______/~~~~~~~\_______/~~~~~~~\_______/~~~~~~~\_______/~~~~~~~\_______/~~~~ *
*
*A 2 place right shift is needed to right justify the input data.
*The REF bit is also be masked in this example
*****************************************************************************************************
*
Loopback
.set NO
;(digital looback mode)
Format
.set BIT_16
;(Data format 16,12,10,8)
IntSync
.set NO
;(internal Frame syncs generated)
IntCLK
.set NO
;(internal clks generated)
BurstMode
.set YES
;(if BurstMode=NO, then Continuous)
CLKDIV
.set 3
;(3=default value, 1/4 CLOCKOUT)
PCM_Mode .set NO
;(Turn on PCM mode)
FS_polarity
.set NO
;(change polarity)YES=^^^\_/^^^, NO=___/^\___
CLK_polarity .set YES
;(change polarity)for BCLKR YES=_/^, NO=~\_
Frame_ignore .set !YES
;(inverted !YES -ignores frame)
XMTautobuf .set NO
;(transmit autobuffering)
RCVautobuf
.set YES
;(receive autobuffering)
XMThalt
.set NO
;(transmit buff halt if XMT buff is full)
RCVhalt
.set NO
;(receive buff halt if RCV buff is full)
XMTbufAddr .set 0x800
;(address of transmit buffer)
XMTbufSize
.set 0x000
;(length of transmit buffer)
*
*
*
*
*
*
*
*
*
DLB bit
FO bit
TXM bit
MCM bit
FSM bit
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