参数资料
型号: PIC18F46J50T-I/PT
厂商: Microchip Technology
文件页数: 42/164页
文件大小: 0K
描述: IC PIC MCU FLASH 64KB 44-TQFP
产品培训模块: PIC18 J Series MCU Overview
PIC18F MPLAB® Starter Kit
标准包装: 1,200
系列: PIC® XLP™ 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 48MHz
连通性: I²C,SPI,UART/USART,USB
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 64KB(32K x 16)
程序存储器类型: 闪存
RAM 容量: 3.8K x 8
电压 - 电源 (Vcc/Vdd): 2.15 V ~ 3.6 V
数据转换器: A/D 13x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 带卷 (TR)
配用: AC164330-ND - MODULE SKT FOR 44TQFP 18F45J10
PIC18F46J50 FAMILY
DS39931D-page 136
2011 Microchip Technology Inc.
10.2
PORTA, TRISA and LATA Registers
PORTA is a 7-bit wide, bidirectional port. It may also
function as a 5-bit or 6-bit port, depending on the oscil-
lator mode selected. Setting a TRISA bit (= 1) will make
the corresponding PORTA pin an input (i.e., put the
corresponding output driver in a High-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).
Reading the PORTA register reads the status of the
pins, whereas writing to it, will write to the port latch.
The Data Latch (LATA) register is also memory mapped.
Read-modify-write operations on the LATA register read
and write the latched output value for PORTA.
Most PORTA pins are multiplexed with analog (ANx)
functionality. In order to use the analog capable pins as
digital inputs, the corresponding PCFG bits in the
ANCON0 register must be set.
Pins, RA0 through RA3, may also be used as compara-
tor inputs by setting the appropriate bits in the CMxCON
registers and configuring the pins as analog inputs.
All PORTA pins have full CMOS output drivers.
The TRISA register controls the direction of the PORTA
pins, even when they are being used as analog inputs.
EXAMPLE 10-2:
INITIALIZING PORTA
Note:
On a Power-on Reset (POR), RA5 and
RA<3:0> are configured as analog inputs
and read as ‘0’.
CLRF
LATA
;Clearing the PORTA latches
;will cause the pins to drive
;low if configured as outputs
MOVLW
0x1F
;Configure AN0-AN4 pins
MOVFF
WREG,ANCON0
;for digital input mode
MOVLW
0xCF
;Example value used to
;initialize data direction
MOVWF
TRISA
;Set RA<3:0> as inputs
;RA4 is unimplemented
;RA5 as output
;RA6 and RA7 as inputs
;(unless overridden by osc settings)
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