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PIC16C925-S/CL датащи(PDF) 36 Page - Microchip Technology

номер детали PIC16C925-S/CL
подробное описание детали  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C925-S/CL датащи(HTML) 36 Page - Microchip Technology

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PIC16C925/926
DS39544A-page 34
Preliminary
 2001 Microchip Technology Inc.
4.4
PORTD and TRISD Registers
PORTD is an 8-bit port with Schmitt Trigger input buff-
ers. The first five pins are configurable as general pur-
pose I/O pins or LCD segment drivers. Pins RD5, RD6
and RD7 can be digital inputs, or LCD segment, or
common drivers.
TRISD controls the direction of pins RD0 through RD4
when PORTD is configured as a digital port.
EXAMPLE 4-4:
INITIALIZING PORTD
FIGURE 4-6:
PORTD <4:0> BLOCK
DIAGRAM
FIGURE 4-7:
PORTD<7:5> BLOCK
DIAGRAM
Note 1: On a Power-on Reset, these pins are
configured as LCD segment drivers.
2: To configure the pins as a digital port, the
corresponding bits in the LCDSE register
must be cleared. Any bit set in the LCDSE
register overrides any bit settings in the
corresponding TRIS register.
BCF
STATUS,RP0
;Select Bank2
BSF
STATUS,RP1
;
BCF
LCDSE, SE29
;Make RD<7:5> digital
BCF
LCDSE, SE0
;Make RD<4:0> digital
BSF
STATUS,RP0
;Select Bank1
BCF
STATUS,RP1
;
MOVLW 0xE0
;Make RD<4:0> outputs
MOVWF TRISD
;Make RD<7:5> inputs
Data
WR
WR
RD
Data Latch
TRIS Latch
Schmitt
Trigger
Input
Buffer
Q
D
CK
Q
D
CK
EN
Q
D
EN
I/O pin
RD
LCD
LCD
LCD Segment
Segment Data
Output Enable
Port
TRIS
Port
TRIS
SE<n>
Bus
RD Port
Schmitt
Trigger
Input
Buffer
EN
QD
EN
Digital Input/
LCDSE<n>
LCD
LCD Segment
LCD Output pin
LCD
LCD Common
Data Bus
RD TRIS
VDD
Segment Data
Output Enable
Common Data
Output Enable



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