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Re: 18F6520之XTAL要用多少頻率,才能使UART之BAUD RATE正確,無%ERROR?
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版主
 
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4.9152MHz
11.0592MHz 18.432MHz UART 的 Baud Rate 一般在使用時有 5%以內的誤差都可以使用，因為每一個 Start Bit 都會同步一次，且每次傳送約10 個 bit, 照理說只要不超過 9% 都是oK 的。
發表於: 2005/11/25 10:24
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18F6520之XTAL要用多少頻率,才能使UART之BAUD RATE正確,無%ERROR?
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初級會員
 
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18F6520依公式:
BRGH = 0 (Low Speed) (Asynchronous) Baud Rate = FOSC/(64(X + 1)) BRGH = 1 (High Speed) Baud Rate = FOSC/(16(X + 1)) 由MANUAL之TABLE 18-3列出的XTAL頻率都有ERROR,無法取得正確的BAUD RATE. 請問我如果要4800 BPS及9600 BPS時,XTAL需用多少MHz,才能使baud rate完全沒有誤差???? 謝謝!!
發表於: 2005/11/24 23:53
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