參數(shù)資料
型號(hào)： PIC16F627-04E/P
廠商： Microchip Technology
文件頁數(shù)： 117/170頁
文件大?。?/td> 0K
描述： IC MCU FLASH 1KX14 18-DIP
標(biāo)準(zhǔn)包裝： 25
系列： PIC® 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
連通性： UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 16
程序存儲(chǔ)器容量： 1.75KB（1K x 14）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量： 224 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 18-DIP（0.300"，7.62mm）
包裝： 管件
配用： DVA16XP183-ND - ADAPTER ICE 18DIP/SOIC/SSOP
PIC16F62X
DS40300C-page 48
Preliminary
2003 Microchip Technology Inc.
7.3
Timer1 Operation in
Asynchronous Counter Mode
If control bit T1SYNC (T1CON<2>) is set, the external
clock input is not synchronized. The timer continues to
increment asynchronous to the internal phase clocks.
The timer will continue to run during SLEEP and can
generate an interrupt on overflow which will wake-up
the processor. However, special precautions in soft-
ware are needed to read/write the timer (Section 7.3.2).
In Asynchronous Counter mode, Timer1 can not be
used
as
a
time-base
for
capture
or
compare
operations.
7.3.1
EXTERNAL CLOCK INPUT TIMING
WITH UNSYNCHRONIZED CLOCK
If control bit T1SYNC is set, the timer will increment
completely asynchronously. The input clock must meet
certain minimum high-time and low-time requirements.
Refer to the appropriate Electrical Specifications
section, Timing Parameters 45, 46, and 47.
7.3.2
READING AND WRITING TIMER1 IN
ASYNCHRONOUS COUNTER
MODE
Reading TMR1H or TMR1L while the timer is running,
from an external asynchronous clock, will ensure a
valid read (taken care of in hardware). However, the
user should keep in mind that reading the 16-bit timer
in two 8-bit values itself poses certain problems since
the timer may overflow between the reads.
For writes, it is recommended that the user simply stop
the timer and write the desired values. A write
contention may occur by writing to the timer registers
while the register is incrementing. This may produce an
unpredictable value in the timer register.
Reading
the
16-bit
value
requires
some
care.
Example 7-1 is an example routine to read the 16-bit
timer value. This is useful if the timer cannot be
stopped.
EXAMPLE 7-1:
READING A 16-BIT FREE-
RUNNING TIMER
; All interrupts are disabled
MOVF
TMR1H, W
;Read high byte
MOVWF
TMPH
;
MOVF
TMR1L, W
;Read low byte
MOVWF
TMPL
;
MOVF
TMR1H, W
;Read high byte
SUBWF
TMPH,
W
;Sub 1st read
; with 2nd read
BTFSC
STATUS,Z
;Is result = 0
GOTO
CONTINUE
;Good 16-bit read
;
; TMR1L may have rolled over between the read
; of the high and low bytes. Reading the high
; and low bytes now will read a good value.
;
MOVF
TMR1H, W
;Read high byte
MOVWF
TMPH
;
MOVF
TMR1L, W
;Read low byte
MOVWF
TMPL
;
; Re-enable the Interrupts (if required)
CONTINUE
;Continue with your code
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F627-04I/P 功能描述:8位微控制器 -MCU 1.75KB 224 RAM 16I/O 4MHz IndTemp PDIP18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F627-04I/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F627 DIP18
PIC16F627-04I/P 制造商:Microchip Technology Inc 功能描述:18 Pin 1.75 KB Std Flash 224 RAM 16 I
PIC16F627-04I/SO 功能描述:8位微控制器 -MCU 1.75KB 224 RAM 16I/O 4MHz IndTemp SOIC18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F627-04I/SO 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F627 SOIC18
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