Question

所以我有一个IPC 16F88, 我设法用它做了几件事, 但现在我在想如何将模拟转换成数字转换?

在互联网上我尝试过许多例子, 但没有成功: (如果有人能说明如何使用ADCON0/1和类似的东西, 我会很感激。

非常感谢。

Edit: this is my code:

START
    banksel TRISA
    clrf    TRISB
    movlw   0xff
    movwf   TRISA
    movlw   b 11000111 
    movwf   OPTION_REG
    movlw   b 00000001 
    movwf   ADCON1
    banksel PORTB
    clrf    PORTB   
LOOP
    btfss   PIR1,ADIF
    goto    LOOP
    bsf ADCON0,GO   
WAIT
    btfsc   ADCON0,GO
    goto    WAIT
    movf    ADRESH,W
    movwf   PORTB,W
END

Answer 1

从《事先知情同意程序》数据表中得出:

The ADRESH:ADRESL registers contain the 10-bit result of the A/D conversion. When the A/D conversion is complete, the result is loaded into this A/D result register pair, the GO/DONE bit (ADCON0<2>) is cleared and the A/D interrupt flag bit ADIF is set. The block diagram of the A/D module is shown in Figure 11-1.

After the A/D module has been configured as desired, the selected channel must be acquired before the conversion is started. The analog input channels must have their corresponding TRIS bits selected as inputs. To determine sample time, see Section 11.1. After this acquisition time has elapsed, the A/D conversion can be started. The following steps should be followed for doing an A/D conversion:

Configure the A/D module: • Configure analog pins / voltage reference / and digital I/O (ADCON1) • Select A/D input channel (ADCON0) • Select A/D conversion clock (ADCON0) • Turn on A/D module (ADCON0)

Configure A/D interrupt (if desired): • Clear ADIF bit • Set ADIE bit • Set GIE bit 3. Wait the required acquisition time.

Start conversion: • Set GO/DONE bit (ADCON0)

Wait for A/D conversion to complete, by either: • Polling for the GO/DONE bit to be cleared OR • Waiting for the A/D interrupt

Read A/D Result register pair (ADRESH:ADRESL), clear bit ADIF if required.

For next conversion, go to step 1 or step 2 as required. The A/D conversion time per bit is defined as TAD. A minimum wait of 2TAD is required before next acquisition starts.

您没有在开始转换前等待获取时间。其它一切似乎都是正确的。

友情链接