参数资料
型号: PIC16F526-I/ST
厂商: Microchip Technology
文件页数: 18/122页
文件大小: 0K
描述: IC PIC MCU FLASH 1KX12 14TSSOP
产品培训模块: 8-bit PIC® Microcontroller Portfolio
标准包装: 96
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: POR,WDT
输入/输出数: 11
程序存储器容量: 1.5KB(1K x 12)
程序存储器类型: 闪存
RAM 容量: 67 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 3x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 14-TSSOP(0.173",4.40mm 宽)
包装: 管件
产品目录页面: 638 (CN2011-ZH PDF)
配用: ICE2000-ND - EMULATOR MPLAB-ICE 2000 POD
PIC18F2221/2321/4221/4321 FAMILY
DS39689F-page 114
2009 Microchip Technology Inc.
11.2
PORTB, TRISB and LATB
Registers
PORTB is an 8-bit wide, bidirectional port. The
corresponding Data Direction register is TRISB. 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.,
put the contents of the output latch on the selected pin).
The Data Latch register (LATB) is also memory
mapped. Read-modify-write operations on the LATB
register read and write the latched output value for
PORTB.
EXAMPLE 11-2:
INITIALIZING PORTB
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is
performed by clearing bit, RBPU (INTCON2<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are
disabled on a Power-on Reset.
Four of the PORTB pins (RB<7:4>) have an interrupt-
on-change feature. Only pins configured as inputs can
cause this interrupt to occur (i.e., any RB<7:4> pin
configured as an output is excluded from the interrupt-
on-change comparison). The input pins (of RB<7:4>)
are compared with the old value latched on the last
read of PORTB. The “mismatch” outputs of RB<7:4>
are ORed together to generate the RB Port Change
Interrupt with Flag bit, RBIF (INTCON<0>).
This interrupt can wake the device from Sleep mode or
any of the Idle modes. The user, in the Interrupt Service
Routine, can clear the interrupt in the following manner:
a) Any read or write of PORTB (except with the
MOVFF (ANY), PORTB instruction).
b) 1 TCY.
c)
Clear flag bit, RBIF.
A mismatch condition will continue to set flag bit, RBIF.
Reading PORTB and waiting 1 TCY will end the
mismatch condition and allow flag bit, RBIF, to be
cleared. Also, if the port pin returns to its original state,
the mismatch condition will be cleared.
The interrupt-on-change feature is recommended for
wake-up on key depression operation and operations
where PORTB is only used for the interrupt-on-change
feature. Polling of PORTB is not recommended while
using the interrupt-on-change feature.
RB3 can be configured by the Configuration bit,
CCP2MX, as the alternate peripheral pin for the CCP2
module (CCP2MX = 0).
Note:
On a Power-on Reset, RB<4:0> are
configured as analog inputs by default and
read as ‘0’; RB<7:5> are configured as
digital inputs.
By
clearing
the
Configuration
bit,
PBADEN, RB<4:0> will alternatively be
configured as digital inputs on POR.
CLRF
PORTB
; Initialize PORTB by
; clearing output
; data latches
CLRF
LATB
; Alternate method
; to clear output
; data latches
MOVLW
0Fh
; Set RB<4:0> as
MOVWF
ADCON1 ; digital I/O pins
; (required if config bit
; PBADEN is set)
MOVLW
0CFh
; Value used to
; initialize data
; direction
MOVWF
TRISB
; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs
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