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Paint QR Code ISO/IEC18004 in Software Port B

Port B
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Binary 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000 23 = 8 24 = 16 25 = 32 26 = 64 27 = 128 22 = 4 21 = 2 20 = 1 Power of Two
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TRISB
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Decimal 134
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Port B
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Decimal 6
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20 = 1
21 = 2
22 = 4
23 = 8
24 = 16
25 = 32
26 = 64
27 = 128
Bit Weight/Values Register Location
RB7 RB6 RB5 RB4 RB3 RB2 RB1
Bit Weight/Values Register Location
Figure 621 Diagram of port B registers
Six
port B I/O pins This correspondence between the bit number, bit weight, and the I/O line is used to program and control the port
Using the TRIS and port registers
The TRIS (tri state enable) register is a 1 byte (8 bit) programmable register on the PIC 16F84 that controls whether a particular I/O pin is configured as an input or output pin There is a TRIS register for each port TRISA controls the I/O status for the pins on port A, and TRISB controls the I/O status for the pins on port B If one places a binary 0 at a bit location in TRISB for port B, the correspond ing pin location on port B will become an output pin If one places a binary 1 at a bit location in the TRISB, the corresponding pin on port B becomes an input pin The TRISB data memory address for port B is 134 (or 86h in hex) After port B has been configured using the TRISB register, the user can read or write to the port, using a port B address (decimal number 6) Here is an example Suppose we want to make all port B lines output lines To do so, we need to put a binary 0 in each bit position in the TRISB register So the number we would write into the register is decimal 0 Now all our I/O lines are configured as output lines If we connect an LED to each output line, we can see a visual indication of any number we write to port B If we want to turn on the LEDs connected to RB2 and RB6, we need to place a binary 1 at each bit position on port B reg ister To accomplish this, we look at the bit weights associated with each line RB2 has a bit weight of 4, and RB6 has a bit weight of 64 We add these num bers (4 64 68) and write that number into the port B register When we write the number 68 into the port B register, the LEDs connected to RB2 and RB6 will light To configure port A, we use the TRISA register, decimal address 133 (see Fig 622) On port A, however, only the first 5 bits of the TRISA and the corre sponding I/O lines (RA0 RA4) are available for use Examine the I/O pin out on the 16F84, and you will find there are only five I/O pins (RA0 RA4) corre sponding to port A These pins are configured using the TRISA register and used with the port A address
Register Port A Port B TRISA TRISB Memory location, hexadecimal 05h 06h 85h 86h Memory location, decimal 5 6 133 134
On power up and reset, all the I/O pins of port B and port A are initial ized (configured) as input pins We can change this configuration with our program
Port A
Decimal 133
Binary 00000001 00000010 00000100 00001000 00010000 21 = 2 22 = 4 23 = 8 24 = 16 20 = 1 Power of Two
TRISA
85 Hex
Port A
Decimal 5
05 Hex
Binary
Power of Two
20 = 1
21 = 2
22 = 4
23 = 8
24 = 16
Bit Weight/Values Register Location
Bit Weight/Values Register Location
Figure 622 Diagram of port A registers
Six
Here s another example Let s configure port B so that bit 0 (RB0) is an input pin and all other pins are output lines To place binary 0s and 1 in the proper bit location, we use the bit weights shown in the binary number table For instance, to turn bit 0 on (1) and all other bits off (0), we would write the dec imal number 1 into TRISB for port B Depending upon which PicBasic compiler is used, the commands are a little different For the PicBasic compiler, the command to write to a register is the poke command The program line to write the decimal value 1 into the TRISB register will look like this:
poke 134,1
The number after the poke command is the memory address that the com mand will write to, in this case 134 The number 134 is the memory address of the TRISB for port B The next number, separated by a comma, is the value we want to write in that memory address In this case it s the number 1 For the PicBasic Pro compiler, the TRISB and TRISA registers are already predefined Thus when the compiler sees TRISB, it accesses the proper memo ry (134) location So the equivalent command for the PicBasic Pro is
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