XL74HC165 Parallel-2-Serail Controller (SOP16)
( SN74LS165, CD74LS165 - DIP16 / SOP16 )
( 不频繁存取, 可以考虑 I2C I/O Expender )
PCF8574/ T module (8bits Address *0x40~0x4E* )
PCF8574A module (8bit address *0x70~0x7E* )
XL74HC165
- fmax : VCC 3.3V < 4.2MHz, VCC 4.5V < 21MHz.
- Rising Edge active: Don’t care < Duty Cycle & Stability >
- MSB First Out.
- QH presented after Latch data
- VCC 4.5V , Vih = 3.15 (min)
Hardware Code
<2023/08/24 : UNTESTED CODE>
//Hardware Pin Define depend on circuit
sbit hwInhibit = 0xA3; // Pin15 nCE
sbit hwSerialIO = 0xA2; // Pin 9 MISO
sbit hwSerialClock = 0xA1; // Pin 2 SCLK
sbit nLoad = 0xA0; // Pin 1 nLatch
// Private Function definition
void InitSerialIO( void);
void vRead74165( unsigned char *databuf);
void vReadSerailIO(unsigned char ucLength, unsigned char *databuf);
/***************************************************************************
* InitSerialIO( void) Initial hardware interface
*/
void InitSerialIO( void)
{
hwInhibit = 0; // Low for bypass or Hardware tight to ground.
hwSerialIO = 1; // Depend on MCU Input I/O stage
hwSerialClock = 1; // Rising edge active data shift out
nLoad = 1 ; // 1=Shift / 0=Load
}
/***************************************************************************
* vRead74165( unsigned char*) Read 8bit data into buffer
* /
// MSB First shift out
void vRead74165( unsigned char *databuf)
{ unsigned char i;
for( i = 0; i <8; i++)
{
*databuf <<=1;
hwSerialClock = 0;
if( hwSerialIO ) { *databuf += 1; }
// Add delay here to prevent glitch if IO too fast
hwSerialClock = 1; // Rising Edge to shitt next bit out to QH
}
}
/***************************************************************************
* vReadSerailIO( ucLength, *databuf) Read Multiple
* /
void vReadSerailIO(unsigned char ucLength, unsigned char *databuf)
{
InitSerialIO( );
nLoad = 0; // Latch Data
nLoad = 1 ; // Enable shift mode
for( ; ucLength >0; ucLength--) vRead74165( databuf++);
}
Example Code
#define TOTALCHIPS 60
extern void vReadSerailIO(unsigned char ucLength, unsigned char *databuf);
void main(void)
{
unsigned char ucSerilIO[ TOTALCHIPS ]
while(1)
{
// Read All Chips
vReadSerailIO( TOTALCHIPS, ucSerilIO );
// Parsing Data for process.
// Mapping channel information and pin stage
}
}
Hardware Xchange < BDFHGECA > Pin Xchange by Layout
/********************************************************************************************
* unsigned char xExchangeMapping( unsigned char ) Pin Xchange by Layout
* /
#if 0
unsigned char xExchangeMapping( unsigned char *databuf)
{
unsigned char ucTemp =0;
ucTemp += (*databuf >> 0) & 0x01; //A
ucTemp += (*databuf >> 6) & 0x02; //B
ucTemp += (*databuf << 1) & 0x04; //C
ucTemp += (*databuf >> 3) & 0x08; //D
ucTemp += (*databuf << 2) & 0x10; //E
ucTemp += (*databuf >> 0) & 0x20; //F
ucTemp += (*databuf << 3) & 0x40; //G
ucTemp += (*databuf << 3) & 0x80; //H
return ucTemp;
}
#else
unsigned char xExchangeMapping( unsigned char databuf)
{
unsigned char ucTemp =0;
ucTemp += (databuf >> 0) & 0x21; // A & F
ucTemp += (databuf >> 6) & 0x02; //B
ucTemp += (databuf << 1) & 0x04; //C
ucTemp += (databuf >> 3) & 0x08; //D
ucTemp += (databuf << 2) & 0x10; //E
ucTemp += (databuf << 3) & 0xC0; // G & H
return ucTemp;
}
#endif
/*********************************************************************************
* unsigned int xGetPinMapping(
* /
unsigned char xGetBitStage( unsigned int uiPin)
{
// SET CHANNEL OPEN
// Delay for Channle stable
// Read 165 Serial In
// Parsing Channel Connection
// Check ADC value for Number of Connections.
// Output Information.
// Check Connection Tables from DATA EPROM.
}
XL74HC165 Parallel-2-Serail Controller
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** 范例码为自用,请勿引用, Ctrl-C, Ctrl-V结果自行承担!
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