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參數(shù)資料
| 型號： | LTC1599BIN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | DAC |
| 英文描述： | 16-Bit Byte Wide, Low Glitch Multiplying DAC with 4-Quadrant Resistors |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 254K |
| 代理商： | LTC1599BIN |
17
LTC1599
Figure 7. Using the 68HC11 to Control the LTC1599
Interfacing to the 68HC11
The circuit in Figure 7 is an example of using the 68HC11
to control the LTC1599. Data is sent to the DAC using two
8-bit parallel transfers from the controller’s Port B. The
WR signal is generated by manipulating the logic output
on Port A’s bit 3, the MLBYTE command is sent to the DAC
using Port A’s bit 4, and the LD command comes from the
SS output on Port D’s bit 5.
The sample listing 68HC11 assembly code in Listing A is
designed to emulate the Timing Diagram found earlier in
this data sheet. After variable declaration, the main portion
of the program retrieves the least significant byte from
memory, forces MLBYTE and WR to a logic low, and then
writes the low byte data to Port B. It then sets WR and
APPLICATIO
S I
FOR
ATIO
U
W
U
U
LTC1599
PORT A, BIT 3
PORT D, BIT 5
PORT A , BIT 4
PORT B
8-BIT PARALLEL
68HC11
1599 F07
WR LD MLBYTE
MLBYTE high. Next, the most significant byte is copied
from memory and WR is again asserted low. The high byte
is written to Port B and WR is returned high. The transfer
of the 16 bits is completed by cycling the LD input low and
then high using the SS output on Port D.
************************************************************
*
* This example program uses 8-bit parallel port B, port A and port D
* to transfer 16-bit parallel data to the LTC1599 16-bit current output
* DAC. Port B at $1004 is used for two eight bit transfers. Port A,
* bit 3 is used for the LTC1599’s WR command and bit 4 is used for the
* MLBYTE command. Port D’ SS output is used for the LTC1599’s LD
* command
*
************************************************************
*
*****************************************
* 68HC11 register definitions
*****************************************
*
* PIOC
EQU
$1002
Parallel I/O control register
*
“STAF,STAI,CWOM,HNDS, OIN, PLS, EGA,INVB”
PORTA
EQU
$1000
Port A data register
*
“Bit7,Bit6,Bit5,Bit4,Bit3,Bit2,Bit1,Bit0”
PORTB
EQU
$1004
Port B data register
*
“Bit7,Bit6,Bit5,Bit4,Bit3,Bit2,Bit1,Bit0”
PORTD
EQU
$1008
Port D data register
*
“ - , - , SS* ,CSK ;MOSI,MISO,TxD ,RxD “
DDRD
EQU
$1009
Port D data direction register
SPCR
EQU
$1028
SPI control register
MBYTE
EQU
$00
This memory location holds the LTC1599’s bits 15 - 08
LBYTE
EQU
$01
This memory location holds the LTC1599’s bits 07 - 00
*
*****************************************
* Start OUTDATA Routine
*****************************************
*
ORG
$C000
Program start location
INIT1
LDAA
#$2F
-,-,1,0;1,1,1,1
*
-, -, SS*-Hi, SCK-Lo, MOSI-Hi, MISO-Hi, X, X
STAA
PORTD
Keeps SS* a logic high when DDRD, Bit5 is set
LDAA
#$38
-,-,1,1;1,0,0,0
STAA
DDRD
SS* , SCK, MOSI are configured as Outputs
*
MISO, TxD, RxD are configured as Inputs
* DDRD’s Bit5 is a 1 so that port D’s SS* pin is a general output
*
*
*
*
*
*
*
*
*
*
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