參數資料
型號: PIC16F84
廠商: Microchip Technology Inc.
英文描述: 18-pin Flash/EEPROM 8-Bit Microcontrollers
中文描述: 18引腳閃存/ EEPROM的8位微控制器
文件頁數: 24/124頁
文件大?。?/td> 1060K
代理商: PIC16F84
PIC16F8X
DS30430C-page 24
1998 Microchip Technology Inc.
EXAMPLE 5-1:
CLRF PORTB ; Initialize PORTB by
; setting output
; data latches
BSF STATUS, RP0 ; Select Bank 1
MOVLW 0xCF ; Value used to
; initialize data
; direction
MOVWF TRISB ; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs
INITIALIZING PORTB
TABLE 5-3
PORTB FUNCTIONS
TABLE 5-4
SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Name
Bit
Buffer Type
TTL/ST
(1)
I/O Consistency Function
RB0/INT
bit0
Input/output pin or external interrupt input. Internal software
programmable weak pull-up.
Input/output pin. Internal software programmable weak pull-up.
Input/output pin. Internal software programmable weak pull-up.
Input/output pin. Internal software programmable weak pull-up.
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up.
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up.
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up. Serial programming clock.
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up. Serial programming data.
RB1
RB2
RB3
RB4
bit1
bit2
bit3
bit4
TTL
TTL
TTL
TTL
RB5
bit5
TTL
RB6
bit6
TTL/ST
(2)
RB7
bit7
TTL/ST
(2)
Legend: TTL = TTL input, ST = Schmitt Trigger.
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
2: This buffer is a Schmitt Trigger input when used in serial programming mode.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
06h
86h
PORTB
TRISB
RB7
TRISB7
RB6
TRISB6
RB5
TRISB5
RB4
TRISB4
RB3
TRISB3
RB2
TRISB2
RB1
TRISB1
RB0/INT
TRISB0
xxxx xxxx
uuuu uuuu
1111 1111
1111 1111
81h
OPTION_
REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
Legend:
x
= unknown,
u
= unchanged. Shaded cells are not used by PORTB.
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