換一顆新的看看。

謝謝版大回覆~~~
我猜也是這樣~~~
只是不知為何只有RA4要做這樣的設計???

在LCD控制暫存器 LCDCON 的 bit6 是否有打開?

bit 6 SLPEN: LCD Driver Enable in Sleep mode bit
1 = LCD driver module is disabled in Sleep mode
0 = LCD driver module is enabled in Sleep mode

在 LCD Clock drive 裡有說明，你可以用外接 Timer1 32768Hz 或是使用內建的 31KHz RC震盪器，這樣在Sleep Mode 下 LCD 能可正常工作。

The first clock source is the system clock divided by
8192 (FOSC/8192). This divider ratio is chosen to
provide about 1 kHz output when the system clock is
8 MHz. The divider is not programmable. Instead, the
LCD prescaler bits, LCDPS<3:0>, are used to set the
LCD frame clock rate.
The second clock source is the T1OSC/32. This also
gives about 1 kHz when a 32.768 kHz crystal is used
with the Timer1 oscillator. To use the Timer1 oscillator
as a clock source, the T1OSCEN (T1CON<3>) bit
should be set.
The third clock source is the 31 kHz LFINTOSC/32,
which provides approximately 1 kHz output.
The second and third clock sources may be used to
continue running the LCD while the processor is in
Sleep.
Using the bits, CS<1:0> (LCDCON<3:2>), any of these
clock sources can be selected.

計算馬達的轉動角度，也就是紀錄馬達的正反轉，轉的角度到運轉速度，也就是馬達的動作回授偵測。一般可以用QEI做伺服控制及Close Loop控制。

RA4 是 Open Drain 設計，如要當一般的I/O 設計的要接提升電阻。

請問一下個位高手一個問題~~~
我使用APP001 REV.2的模擬板~~~
發覺如果RA4要當IO時~~~
要將DSW1的RA4切到ON~~~
如果切到OFF時~~~
IO的功能就無法使用~~~
有人可以幫我解答嗎??
謝謝~~~

Dear All：
　　我想請問一下到底ＰIC18Fxx31的QEI有何用途啊..DATA SHEET 看不太懂...如果設為QEI模式有何幫助咧!!

1.進入SLEEP MODE LCD動不了？
2. 如果沒有進入sleep mode 又達不到客人要求的100uA
3. 我做過實驗 32KHZ 震盪頻率什麼是都不做就要600UA
4. 32khz -->sleep mode 也要82uA我不知道 data sheet 的8.2UA 2 V是如何測出來的，真是夭壽，阿豆仔都看data sheet來要求我的，他奶奶的，我會被害死。
各位大大是否有寫過real time clock 我的產品跟casio clock差不多不過要增加一個RF 發射但是平常我是將rf關閉的
可以給建議嗎？
microchip 的FAE可以幫忙我嗎？
嗚嗚嗚嗚。。。。要是讓阿豆仔寫出來那。。。。面子往那裡擺啊，受傷嚴重的是台灣microchip因為單子又會被義大利的MICROCHIP搶走了，快馬加一鞭幫忙一下吧

我在燒入IC時,忘記將IC放入IC槽,結果LEAP PSTART 燒入器不會停止燒入,MPLAB IDE 也無法關閉燒入動作,,,,

必需等 30 分鐘後,MPLAB IDE 才燒完~~~

請教各位先進
有無18F4480運用AN-878通CAN( Mode 0 – Fully backward compatible Legacy mode)
的範例可參考
448用的是AN-738,可能不符於AN-878
所以......

when I use mcc18 to build code . but it shows :

c:\mcc18\h\p18f4480.h:1850:Error [1109] type mismatch in redeclaration of 'RXF0SIDLbits'
c:\mcc18\h\p18f4480.h:1900:Error [1109] type mismatch in redeclaration of 'RXF1SIDLbits'
c:\mcc18\h\p18f4480.h:1950:Error [1109] type mismatch in redeclaration of 'RXF2SIDLbits'
c:\mcc18\h\p18f4480.h:2000:Error [1109] type mismatch in redeclaration of 'RXF3SIDLbits'
c:\mcc18\h\p18f4480.h:2050:Error [1109] type mismatch in redeclaration of 'RXF4SIDLbits'
c:\mcc18\h\p18f4480.h:2100:Error [1109] type mismatch in redeclaration of 'RXF5SIDLbits'
c:\mcc18\h\p18f4480.h:2144:Error [1109] type mismatch in redeclaration of 'RXM0SIDLbits'
c:\mcc18\h\p18f4480.h:2188:Error [1109] type mismatch in redeclaration of 'RXM1SIDLbits'
c:\mcc18\h\p18f4480.h:2227:Error [1109] type mismatch in redeclaration of 'TXB2CONbits'
c:\mcc18\h\p18f4480.h:2407:Error [1109] type mismatch in redeclaration of 'TXB1CONbits'
c:\mcc18\h\p18f4480.h:2586:Error [1109] type mismatch in redeclaration of 'TXB0CONbits'
c:\mcc18\h\p18f4480.h:2768:Error [1109] type mismatch in redeclaration of 'RXB1CONbits'
c:\mcc18\h\p18f4480.h:2822:Error [1109] type mismatch in redeclaration of 'RXB1DLCbits'
c:\mcc18\h\p18f4480.h:2953:Error [1109] type mismatch in redeclaration of 'RXB0CONbits'
c:\mcc18\h\p18f4480.h:3007:Error [1109] type mismatch in redeclaration of 'RXB0DLCbits'
c:\mcc18\h\p18f4480.h:3115:Error [1109] type mismatch in redeclaration of 'CANSTATbits'
c:\mcc18\h\p18f4480.h:3134:Error [1109] type mismatch in redeclaration of 'CANCONbits'
c:\mcc18\h\p18f4480.h:3162:Error [1109] type mismatch in redeclaration of 'BRGCON2bits'
c:\mcc18\h\p18f4480.h:3198:Error [1109] type mismatch in redeclaration of 'COMSTATbits'
c:\mcc18\h\p18f4480.h:3282:Error [1109] type mismatch in redeclaration of 'PORTAbits'
c:\mcc18\h\p18f4480.h:3318:Error [1109] type mismatch in redeclaration of 'PORTBbits'
c:\mcc18\h\p18f4480.h:3350:Error [1109] type mismatch in redeclaration of 'PORTCbits'
c:\mcc18\h\p18f4480.h:3387:Error [1109] type mismatch in redeclaration of 'PORTDbits'
c:\mcc18\h\p18f4480.h:3394:Error [1109] type mismatch in redeclaration of 'PORTEbits'
c:\mcc18\h\p18f4480.h:3454:Error [1109] type mismatch in redeclaration of 'DDRAbits

Thanks