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PIC16F627-04I/SO 参数 Datasheet PDF下载

PIC16F627-04I/SO图片预览
型号: PIC16F627-04I/SO
PDF下载: 下载PDF文件 查看货源
内容描述: 基于闪存的8位CMOS微控制器 [FLASH-Based 8-Bit CMOS Microcontrollers]
分类和应用: 闪存微控制器和处理器外围集成电路光电二极管PC时钟
文件页数/大小: 160 页 / 1657 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F62X  
Note 1: On reset, the TRISA register is set to all  
inputs. The digital inputs are disabled and  
the comparator inputs are forced to  
ground to reduce excess current con-  
sumption.  
5.0  
I/O PORTS  
The PIC16F62X have two ports, PORTA and PORTB.  
Some pins for these I/O ports are multiplexed with an  
alternate function for the peripheral features on the  
device. In general, when a peripheral is enabled, that  
pin may not be used as a general purpose I/O pin.  
Note 2: When RA6/OSC2/CLKOUT is configured  
as CLKOUT, the corresponding TRIS bit is  
overridden and the pin is configured as an  
output. The PORTA data bit reads 0, and  
the PORTA TRIS bit reads 0.  
5.1  
PORTA and TRISA Registers  
PORTA is an 8-bit wide latch. RA4 is a Schmitt Trigger  
input and an open drain output. Port RA4 is multiplexed  
with the T0CKI clock input. RA5 is a Schmitt Trigger input  
only and has no output drivers. All other RA port pins have  
Schmitt Trigger input levels and full CMOS output drivers.  
All pins have data direction bits (TRIS registers) which can  
configure these pins as input or output.  
TRISA controls the direction of the RA pins, even when  
they are being used as comparator inputs. The user  
must make sure to keep the pins configured as inputs  
when using them as comparator inputs.  
The RA2 pin will also function as the output for the  
voltage reference. When in this mode, the VREF pin is a  
very high impedance output. The user must configure  
TRISA<2> bit as an input and use high impedance  
loads.  
A ’1’ in the TRISA register puts the corresponding output  
driver in a hi- impedance mode. A ’0’ in the TRISA register  
puts the contents of the output latch on the selected pin(s).  
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. So a write  
to a port implies that the port pins are first read, then this  
value is modified and written to the port data latch.  
In one of the comparator modes defined by the  
CMCON register, pins RA3 and RA4 become outputs  
of the comparators. The TRISA<4:3> bits must be  
cleared to enable outputs to use this function.  
EXAMPLE 5-1: INITIALIZING PORTA  
The PORTA pins are multiplexed with comparator and  
voltage reference functions. The operation of these  
pins are selected by control bits in the CMCON  
(comparator control register) register and the VRCON  
(voltage reference control register) register. When  
selected as a comparator input, these pins will read  
as ’0’s.  
CLRF PORTA  
;Initialize PORTA by setting  
;output data latches  
;Turn comparators off and  
;enable pins for I/O  
;functions  
MOVLW 0X07  
MOVWF CMCON  
BCF  
BSF  
STATUS, RP1  
STATUS, RP0 ;Select Bank1  
MOVLW 0x1F  
;Value used to initialize  
;data direction  
MOVWF TRISA  
;Set RA<4:0> as inputs  
;TRISA<7:5> are always  
;read as ’0’.  
1999 Microchip Technology Inc.  
Preliminary  
DS40300B-page 27