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參數(shù)資料
| 型號(hào)： | MC68HC05E0FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁(yè)數(shù)： | 74/96頁(yè) |
| 文件大?。?/td> | 890K |
| 代理商： | MC68HC05E0FN |
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8
MOTOROLA
8-10
MC68HC05E0
SERIAL INTERFACE
8.4
Transmission Error Detection
During a transmission sequence (i.e. only when sending data), the serial interface circuitry checks
for transmission errors caused by external inuences (e.g. picture tube arcing). This transmission
error detection circuitry samples the state of the SDA output pin during transmission, using a
multiple of the transmission frequency, and compares the sampled value with an expected value
in an additional shadow register. The sampled values are ltered for every required value bit (i.e.
a majority decision is taken). The result of the comparison is shown in the Transmission Failure
Flag, TFF (bit 5 of the SI S Register, $0011) for each word transmitted. (See Figure 8-4.)
Figure 8-4 Serial Interface Transmission Error Detection
Data Register
Shadow
Register
Majority
Calculator
TFF
Comparator
Pad
Sample
Logic
Sub-system Clock
Serial Function
Control
76
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