参数资料
型号: PIC16LF720-I/SS
厂商: Microchip Technology
文件页数: 95/135页
文件大小: 0K
描述: MCU PIC 2K FLASH 20-SSOP
产品培训模块: 8-bit PIC® Microcontroller Portfolio
标准包装: 67
系列: PIC® XLP™ 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 16MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 17
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.6 V
数据转换器: A/D 12x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
PIC16(L)F720/721
DS41430C-page 62
Preliminary
2010-2011 Microchip Technology Inc.
6.3
PORTC and TRISC Registers
PORTC is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISC
(Register 6-12). Setting a TRISC bit (= 1) will make the
corresponding PORTC pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISC bit (= 0) will make the corresponding
PORTC pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 6-3 shows how to initialize PORTC.
Reading the PORTC register (Register 6-11) 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 TRISC register (Register 6-12) controls the PORTC
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISC register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’.
EXAMPLE 6-3:
INITIALIZING PORTC
6.3.1
ANSELC REGISTER
The ANSELC register (Register 6-13) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELC bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELC bits has no effect on digital
output functions. A pin with TRIS clear and ANSELC
set will still operate as a digital output, but the Input
mode will be analog. This can cause unexpected
behavior
when
executing
read-modify-write
instructions on the affected port.
BANKSEL PORTC
;
CLRF
PORTC
;Init PORTC
BANKSEL TRISC
;
MOVLW
B‘00001100’ ;Set RC<3:2> as inputs
MOVWF
TRISC
;and set RC<7:4,1:0>
;as outputs
REGISTER 6-11:
PORTC: PORTC REGISTER
R/W-x/u
RC7
RC6
RC5
RC4
RC3
RC2
RC1
RC0
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
RC<7:0>: PORTC General Purpose I/O Pin bits
1 = Port pin is > VIH
0 = Port pin is < VIL
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