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| 型号： | IS89C51-40PQ |
| 厂商： | INTEGRATED SILICON SOLUTION INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 15/48页 |
| 文件大小： | 371K |
| 代理商： | IS89C51-40PQ |
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IS89C51
22
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98
ISSI
Table 8. Serial Port Setup
Mode
SCON
SM2Variation
0
10H
1
50H
2
90H
3
D0H
0NA
1
70H
2
B0H
3
F0H
Single Processor
Environment
(SM2 = 0)
Multiprocessor
Environment
(SM2 = 1)
At the seventh, eighth, and ninth counter states of each bit
time, the bit detector samples the value of RXD. The value
accepted is the value that was seen in at least two of the
three samples. If the value accepted during the first bit time
is not 0, the receive circuits are reset and the unit continues
looking for another 1-to-0 transition. If the start bit proves
valid, it is shifted into the input shift register, and reception
of the rest of the frame proceeds.
As data bits come in from the right, 1s shift out to the left.
When the start bit arrives at the leftmost position in the shift
register (which in Modes 2 and 3 is a 9-bit register), it flags
the RX Control block to do one last shift, load SBUF and
RB8, and set RI. The signal to load SBUF and RB8 and to
set RI is generated if, and only if, the following conditions
are met at the time the final shift pulse is generated:
1) RI = 0, and
2) Either SM2 = 0 or the received ninth data bit = 1
If either of these conditions is not met, the received frame
is irretrievably lost, and RI is not set. If both conditions are
met, the received ninth data bit goes into RB8, and the first
eight data bits go into SBUF. One bit time later, whether the
above conditions were met or not, the unit continues
looking for a 1-to-0 transition at the RXD input.
Note that the value of the received stop bit is irrelevant to
SBUF, RB8, or RI.
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| IS89LV51-12PQ | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44 |
| IS89LV51-24WI | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP40 |
| IS89LV51-40W | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| IS89LV52-12W | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PDIP40 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IS89C51-40PQI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| IS89C51-40W | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH |
| IS89C51-40WI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| IS89C52 | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PL | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
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