参数资料
型号: PIC16F887T-I/PT
厂商: Microchip Technology
文件页数: 2/16页
文件大小: 0K
描述: IC PIC MCU FLASH 8KX14 44TQFP
应用说明: Intro to Capacitive Sensing Appl Notes
Layout and Physical Design Appl Note
产品培训模块: Asynchronous Stimulus
标准包装: 1,200
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
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: 35
程序存储器容量: 14KB(8K x 14)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 368 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 14x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 带卷 (TR)
配用: DM164125-ND - BOARD DEMO PICDEM TOUCH SENSE 1
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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