參數(shù)資料
型號： ENC424J600-I/PT
廠商： Microchip Technology
文件頁數(shù)： 116/168頁
文件大小： 0K
描述： IC ETHERNET CTRLR W/SPI 44-TQFP
視頻文件： Fast 100 Mbps Ethernet PICtail Plus Overview
標(biāo)準(zhǔn)包裝： 160
控制器類型： 以太網(wǎng)控制器（IEEE 802.3）
接口： SPI
電源電壓： 3 V ~ 3.6 V
電流 - 電源： 96mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-TQFP
供應(yīng)商設(shè)備封裝： 44-TQFP（10x10）
包裝： 托盤
產(chǎn)品目錄頁面： 684 (CN2011-ZH PDF)
配用： AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
2007 Microchip Technology Inc.
DS21993C-page 49
PIC16CR7X
6.4
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 6.4.1
In Asynchronous Counter mode, Timer1 cannot be
used as a time base for capture or compare operations.
6.4.1
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 conten-
tion 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. The
example
code
provided
in
and
Example 6-2 demonstrates how to write to and read
Timer1 while it is running in Asynchronous mode.
EXAMPLE 6-1:
WRITING A 16-BIT FREE-RUNNING TIMER
EXAMPLE 6-2:
READING A 16-BIT FREE-RUNNING TIMER
; All interrupts are disabled
CLRF
TMR1L
; Clear Low byte, Ensures no rollover into TMR1H
MOVLW
HI_BYTE
; Value to load into TMR1H
MOVWF
TMR1H, F
; Write High byte
MOVLW
LO_BYTE
; Value to load into TMR1L
MOVWF
TMR1H, F
; Write Low byte
; Re-enable the Interrupt (if required)
CONTINUE
; Continue with your code
; 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 Interrupt (if required)
CONTINUE
; Continue with your code
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