參數(shù)資料
型號: PIC16F1939-I/P
廠商: Microchip Technology
文件頁數(shù): 22/92頁
文件大小: 0K
描述: IC MCU 8BIT FLASH 40-DIP
產品培訓模塊: 8-bit PIC® Microcontroller Portfolio
特色產品: Extreme Low Power (XLP) Microcontrollers
標準包裝: 10
系列: PIC® XLP™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 32MHz
連通性: I²C,LIN,SPI,UART/USART
外圍設備: 欠壓檢測/復位,LCD,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 28KB(16K x 14)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 14x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
PIC18F2480/2580/4480/4580
DS39637D-page 138
2009 Microchip Technology Inc.
11.2
PORTB, TRISB and LATB
Registers
PORTB is an 8-bit wide, bidirectional port. The corre-
sponding Data Direction register is TRISB. Setting a
TRISB bit (= 1) will make the corresponding PORTB
pin an input (i.e., put the corresponding output driver in
a high-impedance mode). Clearing a TRISB bit (= 0)
will make the corresponding PORTB pin an output (i.e.,
put the contents of the output latch on the selected pin).
The Output Latch register (LATB) is also memory
mapped. Read-modify-write operations on the LATB
register read and write the latched output value for
PORTB.
Pins, RB2 through RB3, are multiplexed with the ECAN
peripheral. Refer to Section 24.0 “ECAN Module” for
proper settings of TRISB when CAN is enabled.
EXAMPLE 11-2:
INITIALIZING PORTB
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is
performed by clearing bit, RBPU (INTCON2<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are
disabled on all device resets.
Four of the PORTB pins (RB<7:4>) have an interrupt-
on-change feature. Only pins configured as inputs can
cause this interrupt to occur (i.e., any RB<7:4> pin
configured as an output is excluded from the interrupt-
on-change comparison). The input pins (of RB<7:4>)
are compared with the old value latched on the last
read of PORTB. The “mismatch” outputs of RB<7:4>
are ORed together to generate the RB Port Change
Interrupt with Flag bit, RBIF (INTCON<0>).
This interrupt can wake the device from Sleep. The
user, in the Interrupt Service Routine, can clear the
interrupt in the following manner:
a) Any read or write of PORTB (except with the
MOVFF (ANY), PORTB instruction). This will
end the mismatch condition.
b) 1 TCY.
c)
Clear flag bit, RBIF.
A mismatch condition will continue to set flag bit, RBIF.
Reading PORTB and waiting 1 TCY will end the
mismatch condition and allow flag bit, RBIF, to be
cleared.
The interrupt-on-change feature is recommended for
wake-up on key depression operation and operations
where PORTB is only used for the interrupt-on-change
feature. Polling of PORTB is not recommended while
using the interrupt-on-change feature.
Note:
On a Power-on Reset, RB4, RB1 and RB0
are configured as analog inputs by default
and read as ‘0’; RB<7:5> and RB<3:2>
are configured as digital inputs.
CLRF
PORTB
; Initialize PORTB by
; clearing output
; data latches
CLRF
LATB
; Alternate method
; to clear output
; data latches
MOVLW
0Eh
; Set RB<4:0> as
MOVWF
ADCON1 ; digital I/O pins
; (required if config bit
; PBADEN is set)
MOVLW
0CFh
; Value used to
; initialize data
; direction
MOVWF
TRISB
; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs
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