PIC16F726-I/SP Microchip Technology Inc., PIC16F726-I/SP Datasheet - Page 80

• Manufacturer Part Number: PIC16F726-I/SP
• Description: 28 PIN, 14 KB FLASH, 1.8V-5.5V, 16 MHZ INT. OSC.
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F726-I/SP

• A/d Inputs: 11-Channel, 8-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Frequency: 20 MHz
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 14K Bytes
• Ram Size: 368 Bytes
• Resistance, Drain To Source On: Bytes
• Serial Interface: I2C, SPI, AUSART
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F72X/PIC16LF72X
6.5
PORTD
corresponding
(Register 6-13). Setting a TRISD bit (= 1) will make the
corresponding PORTD pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISD bit (= 0) will make the corresponding
PORTD pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 6-4 shows how to initialize PORTD.
Reading the PORTD register (Register 6-12) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then written
to the PORT data latch.
The TRISD register (Register 6-13) controls the
PORTD pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits
in the TRISD register are maintained set when using
them as analog inputs. I/O pins configured as analog
input always read ‘0’.
REGISTER 6-12:
DS41341B-page 78
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
Note 1:
Note 1: PORTD is available on PIC16F724/LF724
R/W-x
RD7
(1)
PORTD and TRISD Registers
is a 8-bit wide, bidirectional port. The
PORTD is not implemented on PIC16F722/723/726/PIC16LF722/723/726 devices, read as ‘0’.
and PIC16F727/LF727 only.
data
RD<7:0>: PORTD General Purpose I/O Pin bits
1 = Port pin is > V
0 = Port pin is < V
R/W-x
RD6
PORTD: PORTD REGISTER
direction
W = Writable bit
‘1’ = Bit is set
register
R/W-x
IH
IL
RD5
is
TRISD
R/W-x
RD4
Preliminary
(1)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-x
EXAMPLE 6-4:
6.5.1
The ANSELD register (Register 6-9) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELD bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELD bits has no affect on digital
output functions. A pin with TRIS clear and ANSEL set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
RD3
BANKSEL PORTD
CLRF
BANKSEL ANSELD
CLRF
BANKSEL TRISD
MOVLW
MOVWF
Note:
PORTD
ANSELD
B‘00001100’
TRISD
ANSELD REGISTER
The ANSELD register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs will
read ‘0’.
R/W-x
RD2
INITIALIZING PORTD
© 2008 Microchip Technology Inc.
;
;Init PORTD
;Make PORTD digital
;
;Set RD<3:2> as inputs
;and set RD<7:4,1:0>
;as outputs
x = Bit is unknown
R/W-x
RD1
R/W-x
RD0
bit 0