參數(shù)資料
型號： 16F630
廠商： Microchip Technology Inc.
英文描述： 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers
中文描述： 14引腳基于閃存的8位CMOS微控制器
文件頁數(shù)： 21/132頁
文件大?。?/td> 2651K
代理商： 16F630
2003 Microchip Technology Inc.
DS40039C-page 19
PIC16F630/676
3.0
PORTS A AND C
There are as many as twelve general purpose I/O pins
available. Depending on which peripherals are
enabled, some or all of the pins may not be available as
general purpose I/O. In general, when a peripheral is
enabled, the associated pin may not be used as a
general purpose I/O pin.
3.1
PORTA and the TRISA Registers
PORTA is an 6-bit wide, bi-directional port. The corre-
sponding data direction register is TRISA. Setting a
TRISA bit (= 1) will make the corresponding PORTA pin
an input (i.e., put the corresponding output driver in a
Hi-impedance mode). Clearing a TRISA bit (= 0) will
make the corresponding PORTA pin an output (i.e., put
the contents of the output latch on the selected pin).
The exception is RA3, which is input only and its TRIS
bit will always read as ‘1’. Example 3-1 shows how to
initialize PORTA.
Reading the PORTA register 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. RA3 reads ‘0’ when MCLREN = 1.
The TRISA register controls the direction of the
PORTA pins, even when they are being used as analog
inputs. The user must 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 3-1:
bcf
clrf
movlw
movwf
bsf
clrf
movlw
movwf
INITIALIZING PORTA
;Bank 0
;Init PORTA
;Set RA<2:0> to
;digital I/O
;Bank 1
;digital I/O
;Set RA<3:2> as inputs
;and set RA<5:4,1:0>
;as outputs
;Bank 0
3.2
Additional Pin Functions
Every PORTA pin on the PIC16F630/676 has an
interrupt-on-change option and every PORTA pin,
except RA3, has a weak pull-up option. The next two
sections describe these functions.
3.2.1
WEAK PULL-UP
Each of the PORTA pins, except RA3, has an individu-
ally configurable weak internal pull-up. Control bits
WPUAx enable or disable each pull-up. Refer to
Register 3-3. Each weak pull-up is automatically turned
off when the port pin is configured as an output. The
pull-ups are disabled on a Power-on Reset by the
RAPU bit (OPTION<7>).
REGISTER 3-1:
PORTA — PORTA REGISTER (ADDRESS: 05h)
Note:
Additional information on I/O ports may be
found in the PICmicro Mid-Range Refer-
ence Manual, (DS33023)
Note:
The ANSEL (9Fh) and CMCON (19h)
registers must be initialized to configure an
analog channel as a digital input. Pins
configured as analog inputs will read ‘0’.
The ANSEL register is defined for the
PIC16F676.
STATUS,RP0
PORTA
05h
CMCON
STATUS,RP0
ANSEL
0Ch
TRISA
bcf
STATUS,RP0
U-0
U-0
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
—
—
RA5
RA4
RA3
RA2
RA1
RA0
bit 7
bit 0
bit 7-6:
Unimplemented
: Read as ’0’
bit 5-0:
PORTA<5:0>
: PORTA I/O pin
1
= Port pin is >V
IH
0
= Port pin is <V
IL
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
相關(guān)PDF資料
PDF描述
16F84 CAT 5E CROSSOVER, BLUE 15 FT PATCH CABLE
16F84A CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT
16F871 CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
16F872 CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
16F876A 28/40-pin Enhanced FLASH Microcontrollers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
16F684-I 制造商:Microchip Technology Inc 功能描述:
16F6H 制造商:EDAL 制造商全稱:EDAL 功能描述:Silicon High Voltage Assembly
16F6H1 制造商:EDAL 制造商全稱:EDAL 功能描述:Silicon High Voltage Assembly
16F7674 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMD TWEEZER HEAD
16F7676 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CLIP KABELKIT
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*