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参数资料
型号： PIC12F1840-E/P
厂商： Microchip Technology
文件页数： 17/122页
文件大小： 0K
描述： MCU 7KB FLASH 256B RAM XLP 8PDIP
产品培训模块： 8-bit PIC® Microcontroller Portfolio
标准包装： 60
系列： PIC® XLP™ 12F
核心处理器： PIC
芯体尺寸： 8-位
速度： 32MHz
连通性： I²C，LIN，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 5
程序存储器容量： 7KB（4K x 14）
程序存储器类型： 闪存
EEPROM 大小： 256 x 8
RAM 容量： 256 x 8
电压 - 电源 (Vcc/Vdd)： 2.3 V ~ 5.5 V
数据转换器： A/D 4x10b
振荡器型： 内部
工作温度： -40°C ~ 125°C
封装/外壳： 8-DIP（0.300"，7.62mm）
包装： 管件
2011 Microchip Technology Inc.
Preliminary
DS41441B-page 113
PIC12(L)F1840
12.2
PORTA Registers
PORTA is a 6-bit wide, bidirectional port. The
corresponding data direction register is TRISA
(Register 12-3). 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). The exception is RA3, which is
input only and its TRIS bit will always read as ‘1’.
Example 12-1 shows how to initialize PORTA.
Reading the PORTA register (Register 12-2) 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 (LATA).
The TRISA register (Register 12-3) 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’.
12.2.1
ANSELA REGISTER
The ANSELA register (Register 12-5) 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.
EXAMPLE 12-1:
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
LATA
;Data Latch
CLRF
LATA
;
BANKSEL
ANSELA
;
CLRF
ANSELA
;digital I/O
BANKSEL
TRISA
;
MOVLW
B'00111000' ;Set RA<5:3> as inputs
MOVWF
TRISA
;and set RA<2:0> as
;outputs
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相关代理商/技术参数
参数描述
PIC12F1840-I/MF 功能描述:8位微控制器 -MCU 7KB Flash EEPROM 256b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC12F1840-I/MF 制造商:Microchip Technology Inc 功能描述:; Controller Family/Series:PIC12F; Core
PIC12F1840-I/P 功能描述:8位微控制器 -MCU 7KB Flash EEPROM 256b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC12F1840-I/PC01 制造商:Microchip Technology Inc 功能描述:
PIC12F1840-I/SN 功能描述:8位微控制器 -MCU 7KB Flash EEPROM 256b nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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