参数资料
型号: MC68HCP11A1CFNE3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52
封装: PLASTIC, LCC-52
文件页数: 101/158页
文件大小: 776K
代理商: MC68HCP11A1CFNE3
MC68HC11A8
SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
TECHNICAL DATA
5-3
5
Once a valid start bit is detected, the start bit, each data bit, and the stop bit are sam-
pled three times at RT intervals 8 RT, 9 RT, and 10 RT (1 RT is the position where the
bit is expected to start), as shown in Figure 5-2. The value of the bit is determined by
voting logic which takes the value of the majority of samples.
Figure 5-2 Sampling Technique Used on All Bits
5.5 Start Bit Detection
When the RxD input is detected low, it is tested for three more sample times (referred
to as the start edge verification samples in Figure 5-3). If at least two of these three
verification samples detect a logic zero, a valid start bit has been detected, otherwise
the line is assumed to be idle. A noise flag is set if all three verification samples do not
detect a logic zero. A valid start bit could be assumed with a set noise flag present.
If there has been a framing error without detection of a break (10 zeros for 8-bit format
or 11 zeros for 9-bit format), the circuit continues to operate as if there actually was a
stop bit and the start edge will be placed artificially. The last bit received in the data
shift register is inverted to a logic one, and the three logic one start qualifiers (shown
in Figure 5-3) are forced into the sample shift register during the interval when detec-
tion of a start bit is anticipated (see Figure 5-4); therefore, the start bit will be accepted
no sooner than it is anticipated.
If the receiver detects that a break produced the framing error, the start bit will not be
artificially induced and the receiver must actually detect a logic one before the start bit
can be recognized. See Figure 5-5.
16
1
8
9
10
RxD
SCI BIT SAMPLING
PREVIOUS BIT
PRESENT BIT
NEXT BIT
SAMPLES
16
1
vvv
R
RRR
R
T
TTT
T
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