参数资料
型号: PIC16LF720-I/SS
厂商: Microchip Technology
文件页数: 80/135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
2010-2011 Microchip Technology Inc.
Preliminary
DS41430C-page 49
PIC16(L)F720/721
6.1.3
ANSELA REGISTER
The ANSELA register (Register 6-5) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELA 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 ANSELA bits has no affect on digital
output functions. A pin with TRIS clear and ANSEL 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.
REGISTER 6-4:
IOCA: INTERRUPT-ON-CHANGE PORTA REGISTER
U-0
R/W-0
IOCA5
IOCA4
IOCA3
IOCA2
IOCA1
IOCA0
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 7-6
Unimplemented: Read as ‘0’
bit 5-0
IOCA<5:0>: Interrupt-on-Change PORTA Control bits
1 =
Interrupt-on-change enabled(1)
0 =
Interrupt-on-change disabled
Note 1: Interrupt-on-change also requires that the RABIE bit of the INTCON register be set.
REGISTER 6-5:
ANSELA: PORTA ANALOG SELECT REGISTER
U-0
R/W-1
U-0
R/W-1
ANSA4
ANSA2
ANSA1
ANSA0
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 7-5
Unimplemented: Read as ‘0’
bit 4
ANSA4: Analog Select between Analog or Digital Function on Pin RA<4>
0 = Digital I/O. Pin is assigned to port or digital special function.
1 = Analog input. Pin is assigned as analog input(1). Digital input buffer is disabled.
bit 3
Unimplemented: Read as ‘0’
bit 2-0
ANSA<2:0>: Analog Select between Analog or Digital Function on Pins RA<2:0>, respectively
0 = Digital I/O. Pin is assigned to port or digital special function.
1 = Analog input. Pin is assigned as analog input(1). Digital input buffer is disabled.
Note 1:
Setting a pin to an analog input automatically disables the digital input circuitry. Weak pull-ups, if
available, are unaffected. The corresponding TRIS bit must be set to Input mode by the user in order to
allow external control of the voltage on the pin.
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