參數(shù)資料
型號： 24C01SC
廠商： Microchip Technology Inc.
英文描述： 1K 5.0V IIC serial EEPROMs(2.5V~5.5V,1K位,1M次擦寫周期,ISO7816標準)
中文描述： 一千5.0V國際進口電壓（2.5V?5.5V的，每1000位，100萬次擦寫周期，符合ISO7816標準串行EEPROM）
文件頁數(shù)： 50/170頁
文件大小： 4191K
代理商： 24C01SC
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
相關PDF資料
PDF描述
24C02SC 2K 5.0V IIC serial EEPROMs(2.5V~5.5V,2K位,1M次擦寫周期,ISO7816標準)
24C02A 2K 5.0V CMOS serial EEPROMs(2K位,5.0V,IIC串行EEPROM)
24C02C 2K 5.0V IIC serial EEPROMs(2K位，1M次擦寫周期，硬件寫保護，二線串行接口,EEPROM)
24C02C-EP 2K 5.0V I 2 C ⑩ Serial EEPROM
24C02C-ESN 2K 5.0V I 2 C ⑩ Serial EEPROM
相關代理商/技術參數(shù)
參數(shù)描述
24C01SC/S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SERIAL EEPROM|128X8|CMOS|DIE
24C01SC-/S 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:1K/2K 5.0V I2C Serial EEPROMs for Smart Cards
24C01SC/S08 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SERIAL EEPROM|128X8|CMOS|DIE
24C01SC-/S08 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:1K/2K 5.0V I2C Serial EEPROMs for Smart Cards
24C01SC/W 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SERIAL EEPROM|128X8|CMOS|WAFER
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