參數(shù)資料
型號(hào): PIC16F871T-E/L
廠商: Microchip Technology
文件頁數(shù): 99/143頁
文件大小: 0K
描述: IC MCU CMOS 20MHZ 2K FLSH 44PLCC
標(biāo)準(zhǔn)包裝: 500
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 33
程序存儲(chǔ)器容量: 3.5KB(2K x 14)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 帶卷 (TR)
2003 Microchip Technology Inc.
DS30569B-page 57
PIC16F870/871
8.3
Compare Mode
In Compare mode, the 16-bit CCPR1 register value is
constantly compared against the TMR1 register pair
value. When a match occurs, the RC2/CCP1 pin is:
Driven high
Driven low
Remains unchanged
The action on the pin is based on the value of control
bits, CCP1M3:CCP1M0 (CCP1CON<3:0>). At the
same time, interrupt flag bit CCP1IF is set.
FIGURE 8-2:
COMPARE MODE
OPERATION BLOCK
DIAGRAM
8.3.1
CCP PIN CONFIGURATION
The user must configure the RC2/CCP1 pin as an
output by clearing the TRISC<2> bit.
8.3.2
TIMER1 MODE SELECTION
Timer1 must be running in Timer mode, or Synchro-
nized Counter mode, if the CCP module is using the
compare feature. In Asynchronous Counter mode, the
compare operation may not work.
8.3.3
SOFTWARE INTERRUPT MODE
When Generate Software Interrupt mode is chosen, the
CCP1 pin is not affected. The CCPIF bit is set, causing
a CCP interrupt (if enabled).
8.3.4
SPECIAL EVENT TRIGGER
In this mode, an internal hardware trigger is generated,
which may be used to initiate an action.
The special event trigger output of CCP1 resets the
TMR1 register pair, and starts an A/D conversion (if A/D
module is enabled). This allows the CCPR1 register to
effectively be a 16-bit programmable period register for
Timer1.
Note:
Clearing the CCP1CON register will force
the RC2/CCP1 compare output latch to
the default low level. This is not the
PORTC I/O data latch.
CCPR1H CCPR1L
TMR1H
TMR1L
Comparator
QS
R
Output
Logic
Special Event Trigger
Set Flag bit CCP1IF
(PIR1<2>)
Match
RC2/CCP1
TRISC<2>
CCP1CON<3:0>
Mode Select
Output Enable
pin
Special event trigger will:
reset Timer1, but not set interrupt flag bit TMR1IF (PIR1<0>),
and set bit GO/DONE (ADCON0<2>).
Note:
The special event trigger from the CCP1
module will not set interrupt flag bit
TMR1IF (PIR1<0>).
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