參數(shù)資料
型號(hào): PIC16F883-I/ML
廠商: Microchip Technology
文件頁(yè)數(shù): 2/16頁(yè)
文件大小: 0K
描述: IC PIC MCU FLASH 4KX14 28QFN
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 61
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 24
程序存儲(chǔ)器容量: 7KB(4K x 14)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 11x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤(pán)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 640 (CN2011-ZH PDF)
配用: MCP1631RD-MCC2-ND - REFERENCE DESIGN MCP1631HV
AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
PIC16F88X
DS80302F-page 10
2009 Microchip Technology Inc.
8.
Module: Asynchronous Timer1
This Errata supersedes Errata DS80233 and
DS80329.
When TImer1 is started or updated, the timer
needs to see a falling edge from the external clock
source before a rising edge can increment the
counter. If writes to TMR1H and TMR1L are not
completed while the external clock pulse is still
high, Timer1 will not count the first clock pulse
after the update.
When using an external crystal, the pulse width
from
rising
to
falling
edge
is
temperature
dependent and may decrease with temperature.
As a result, the timer may require an additional
oscillation to overflow.
Work around
Switching to the HFINTOSC after reloading, the
timer ensures the Timer1 will see a falling edge
before switching back to the external clock source.
Due to the time from Timer1 overflow to the reload
being application specific, wait for the timer to
increment before beginning the reload sequence.
This ensures the timer does not miss a rising edge
during reload.
EXAMPLE 3:
Affected Silicon Revisions
PIC16F882
PIC16F883/PIC16F884
PIC16F886/PIC16F887
BTFSC
TMR1L,0
GOTO
$-1
BTFSS
TMR1L,0
GOTO
$-1
;Timer has just incremented, 31
μs before next rising edge to
;complete reload
Update:
BCF
T1CON,TMR1CS
;Select HFINTOSC for Timer1
BSF
TMR1H,7
;Timer1 high byte 0x80
BCF
T1CON,TMR1ON
;Timer1 off
BSF
T1CON,TMR1CS
;Select external crystal
BCF
T1CON,TMR1ON
;Timer1 on
Critical Timing of code sequence for instructions following last write to TMR1L or TMR1H.
A0
X
A0
X
A2
X
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