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PIC17C752-08/P bảng dữ liệu(PDF) 69 Page - Microchip Technology

tên linh kiện PIC17C752-08/P
Giải thích chi tiết về linh kiện  High-Performance 8-Bit CMOS EPROM Microcontrollers
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nhà sản xuất  MICROCHIP [Microchip Technology]
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© 1997 Microchip Technology Inc.
Preliminary
DS30264A-page 69
PIC17C75X
Example 10-2 shows an instruction sequence to initial-
ize PORTB. The Bank Select Register (BSR) must be
selected to Bank 0 for the port to be initialized. The fol-
lowing example uses the MOVLB instruction to load the
BSR register for bank selection.
EXAMPLE 10-2: INITIALIZING PORTB
MOVLB
0
; Select Bank 0
CLRF
PORTB
; Initialize PORTB by clearing
;
output data latches
MOVLW
0xCF
; Value used to initialize
;
data direction
MOVWF
DDRB
; Set RB<3:0> as inputs
;
RB<5:4> as outputs
;
RB<7:6> as inputs
FIGURE 10-6: BLOCK DIAGRAM OF RB3:RB2 PORT PINS
Note: I/O pins have protection diodes to VDD and Vss.
Data Bus
Q
D
CK
Q
D
CK
R
Weak
Pull-Up
Port
Input Latch
Port
Data
OE
Peripheral_enable
Peripheral_output
WR_PORTB (Q4)
WR_DDRB (Q4)
RD_PORTB (Q2)
RD_DDRB (Q2)
RBIF
RBPU
Match Signal
from other
port pins
(PORTA<7>)
Peripheral Data in



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