[英]How to make timer0 use a prescaler of 1:64 in 16 bit mode?
我確實對定時器沒有很好的了解,但是我試圖更改timer0以使其在16位模式下使用1:64的預分頻器嗎? 我從Microchip那里獲得了定時器代碼,它使用的是8位模式,沒有預分頻器。 下載文件
這是我懷疑必須處理預分頻器的部分代碼。
TMR_CON = 0b00000000 | CLOCK_DIVIDER_SETTING;
TMR_IP = 1;
TMR_IF = 0;
TMR_IE = 1;
TMR_ON = 1;
這是來自PIC18F87J11數據手冊中有關預分頻器的一些信息
T0PS2:T0PS0: Timer0 Prescaler Select bits
111 = 1:256 Prescale value
110 = 1:128 Prescale value
101 = 1:64 Prescale value
100 = 1:32 Prescale value
011 = 1:16 Prescale value
010 = 1:8 Prescale value
001 = 1:4 Prescale value
000 = 1:2 Prescale value
我假設要使用1:64預分頻器,必須將代碼更改為以下代碼,對嗎?
TMR_CON = 0b00000101 | CLOCK_DIVIDER_SETTING;
TMR_IP = 1;
TMR_IF = 0;
TMR_IE = 1;
TMR_ON = 1;
現在,請告訴我如何將其從8位模式更改為16位模式? 就像我說的我是初學者一樣,所以請以我的理解水平進行解釋。
提前感謝!
從Microchip數據表:
T0CON: TIMER0 CONTROL REGISTER
bit 7 TMR0ON: Timer0 On/Off Control bit
1 = Enables Timer0
0 = Stops Timer0
bit 6 T08BIT: Timer0 8-Bit/16-Bit Control bit
1 = Timer0 is configured as an 8-bit timer/counter
0 = Timer0 is configured as a 16-bit timer/counter
bit 5 T0CS: Timer0 Clock Source Select bit
1 = Transition on T0CKI pin input edge
0 = Internal clock (FOSC/4)
bit 4 T0SE: Timer0 Source Edge Select bit
1 = Increments on high-to-low transition on T0CKI pin
0 = Increments on low-to-high transition on T0CKI pin
bit 3 PSA: Timer0 Prescaler Assignment bit
1 = TImer0 prescaler is not assigned; Timer0 clock input bypasses prescaler
0 = Timer0 prescaler is assigned; Timer0 clock input comes from prescaler output
bit 2-0 T0PS<2:0>: Timer0 Prescaler Select bits
111 = 1:256 Prescale value
110 = 1:128 Prescale value
101 = 1:64 Prescale value
100 = 1:32 Prescale value
011 = 1:16 Prescale value
010 = 1:8 Prescale value
001 = 1:4 Prescale value
000 = 1:2 Prescale value
等於:
T0CON =b'10000nnn' //where nnn is Prescaler value
如果需要在Timer0溢出時進行中斷,則還應使能Timer0中斷位(GIE / GIEH,PEIE / GIEL,TMR0IE,TMR0IF)。
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