参数资料
型号: MC68HC705C9ACFNE
厂商: Freescale Semiconductor
文件页数: 79/118页
文件大小: 0K
描述: IC MCU 8BIT 44-PLCC
标准包装: 26
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 24
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 352 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
Address Mark Wakeup
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
63
9.9 Address Mark Wakeup
In address mark wakeup, the most significant bit (MSB) in a character is used to indicate whether it is an
address (logic 1) or data (logic 0) character. Sleeping receivers will wake up whenever an address
character is received. Systems using this method for wakeup would set the MSB of the first character of
each message and leave it clear for all other characters in the message. Idle periods may be present
within messages and no idle time is required between messages for this wakeup method.
9.10 Receive Data In (RDI)
Receive data is the serial data that is applied through the input line and the SCI to the internal bus. The
receiver circuitry clocks the input at a rate equal to 16 times the baud rate. This time is referred to as the
RT rate in Figure 9-4 and as the receiver clock in Figure 9-6.
The receiver clock generator is controlled by the baud rate register; however, the SCI is synchronized by
the start bit, independent of the transmitter.
Once a valid start bit is detected, the start bit, each data bit, and the stop bit are sampled 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 9-5. The value of the bit is
determined by voting logic which takes the value of the majority of the samples. A noise flag is set when
all three samples on a valid start bit or data bit or the stop bit do not agree.
Figure 9-4. SCI Examples of Start Bit Sampling Techniques
Figure 9-5. SCI Sampling Technique Used on All Bits
11
1
0
11
1
0
1
0
11101
111
0000
NOISE
START
RDI
IDLE
1RT
2RT
3RT
4RT
5RT
6RT
7RT
RT CLOCK EDGES FOR ALL THREE EXAMPLES
16X INTERNAL SAMPLING CLOCK
9RT
8RT
10RT
16RT 1RT
SAMPLES
NEXT BIT
PREVIOUS BIT
RDI
相关PDF资料
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