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参数资料
型号： PIC16LF720-I/SS
厂商： Microchip Technology
文件页数： 88/135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 56
Preliminary
2010-2011 Microchip Technology Inc.
6.2
PORTB and TRISB Registers
PORTB is an 8-bit wide, bidirectional port. The
corresponding data direction register is TRISB
(Register 6-7). Setting a TRISB bit (= 1) will make the
corresponding PORTB pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISB bit (= 0) will make the corresponding
PORTB pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 6-2 shows how to initialize PORTB.
Reading the PORTB register (Register 6-6) 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 TRISB register (Register 6-7) controls the PORTB
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISB register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’. Example 6-2 shows how to initialize PORTB.
EXAMPLE 6-2:
INITIALIZING PORTB
6.2.1
ANSELB REGISTER
The ANSELB register (Register 6-10) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELB 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 ANSELB bits has no affect on digital
output functions. A pin with TRIS clear and ANSELB
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.
6.2.2
WEAK PULL-UPS
Each of the PORTB pins has an individually configurable
internal weak pull-up. Control bits WPUB<7:4> enable or
disable each pull-up (see Register 6-8). Each weak pull-
up is automatically turned off when the port pin is
configured as an output. All pull-ups are disabled on a
Power-on Reset by the RABPU bit of the OPTION_REG
register.
6.2.3
INTERRUPT-ON-CHANGE
All of the PORTB pins are individually configurable as an
interrupt-on-change pin. Control bits IOCB<7:4> enable
or disable the interrupt function for each pin. Refer to
Register 6-9. The interrupt-on-change feature is
disabled on a Power-on Reset.
For enabled interrupt-on-change pins, the present value
is compared with the old value latched on the last read
of PORTB to determine which bits have changed or
mismatched the old value. The ‘mismatch’ outputs of
the last read are OR’d together to set the PORTB
Change Interrupt Flag bit (RABIF) in the INTCON
register.
This interrupt can wake the device from Sleep. The user,
in the Interrupt Service Routine, clears the interrupt by:
a) Any read or write of PORTB. This will end the
mismatch condition.
b) Clear the flag bit RABIF.
A mismatch condition will continue to set flag bit RABIF.
Reading or writing PORTB will end the mismatch
condition and allow flag bit RABIF to be cleared. The latch
holding the last read value is not affected by a MCLR nor
Brown-out Reset. After these Resets, the RABIF flag will
continue to be set if a mismatch is present.
Note:
The ANSELB register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
BANKSEL PORTB
;
CLRF
PORTB
;Init PORTB
BANKSEL ANSELB
CLRF
ANSELB ;Make RB<7:4> digital
BANKSEL TRISB
;
MOVLW
B’11110000’;Set RB<7:4> as inputs
MOVWF
TRISB
;
Note:
When a pin change occurs at the same
time as a read operation on PORTB, the
RABIF flag will always be set. If multiple
PORTB pins are configured for the
interrupt-on-change, the user may not be
able to identify which pin changed state.
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