參數(shù)資料
型號： PIC16F707-I/MV
廠商： Microchip Technology
文件頁數(shù)： 74/123頁
文件大小： 0K
描述： MCU PIC 14KB FLASH 40-UQFN
產(chǎn)品培訓模塊： 8-bit PIC® Microcontroller Portfolio
特色產(chǎn)品： Extreme Low Power (XLP) Microcontrollers
標準包裝： 73
系列： PIC® XLP™ mTouch™ 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 36
程序存儲器容量： 14KB（8K x 14）
程序存儲器類型： 閃存
RAM 容量： 363 x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
數(shù)據(jù)轉換器： A/D 14x8b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 40-UFQFN 裸露焊盤
包裝： 管件
PIC16(L)F707
DS41418B-page 54
2010-2011 Microchip Technology Inc.
6.2
PORTA and TRISA Registers
PORTA is a 8-bit wide, bidirectional port. The
corresponding
data
direction
register
is
TRISA
(Register 6-3). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 6-1 shows how to
initialize PORTA.
Reading the PORTA register (Register 6-2) 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 TRISA register (Register 6-3) controls the PORTA
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISA register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’.
EXAMPLE 6-1:
INITIALIZING PORTA
Note:
The ANSELA register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
BANKSEL PORTA
;
CLRF
PORTA
;Init PORTA
BANKSEL ANSELA
;
CLRF
ANSELA
;digital I/O
BANKSEL TRISA
;
MOVLW
0Ch
;Set RA<3:2> as inputs
MOVWF
TRISA
;and set RA<7:4,1:0>
;as outputs
REGISTER 6-2:
PORTA: PORTA REGISTER
R/W-x
RA7
RA6
RA5
RA4
RA3
RA2
RA1
RA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
RA<7:0>: PORTA I/O Pin bits
1
= Port pin is > VIH
0
= Port pin is < VIL
REGISTER 6-3:
TRISA: PORTA TRI-STATE REGISTER
R/W-1
TRISA7
TRISA6
TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
TRISA<7:0>: PORTA Tri-State Control bits
1
= PORTA pin configured as an input (tri-stated)
0
= PORTA pin configured as an output
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