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| 型號(hào)： | IC80C32-12PQ |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | CMOS單芯片8位微控制器 |
| 文件頁數(shù)： | 21/48頁 |
| 文件大?。?/td> | 274K |
| 代理商： | IC80C32-12PQ |
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Integrated Circuit Solution Inc.
MC002-0B
21
IC80C52
IC80C32
Using the Timer 1 to Generate Baud Rates
When Timer 1 is the baud rate generator, the baud rates in
Modes 1 and 3 are determined by the Timer 1 overflow rate
and the value of SMOD according to the following equation.
Mode 1, 3
Baud Rate=
2
SMOD
32
X
(Timer 1 Overflow Rate)
The Timer 1 interrupt should be disabled in this application.
The Timer itself can be configured for either timer or
counter operation in any of its three running modes. In the
most typical applications, it is configured for timer operation
in auto-reload mode (high nibble of TMOD = 0010B). In this
case, the baud rate is given by the following formula.
Mode 1,3
Baud Rate
2
SMOD
32
X
Oscillator Frequency
12x [256 – (TH1)]
=
Programmers can achieve very low baud rates with Timer
1 by leaving the Timer 1 interrupt enabled, configuring the
Timer to run as a 16-bit timer (high nibble of TMOD =
0001B), and using the Timer 1 interrupt to do a 16-bit
software reload.
Table 9 lists commonly used baud rates and how they can
be obtained from Timer 1.
Multiprocessor Communications
Modes 2 and 3 have a special provision for multiprocessor
communications. In these modes, nine data bits are
received, followed by a stop bit. The ninth bit goes into RB8;
then comes a stop bit. The port can be programmed such
that when the stop bit is received, the serial port interrupt
is activated only if RB8 = 1. This feature is enabled by
setting bit SM2 in SCON.
The following example shows how to use the serial interrupt
for multiprocessor communications. When the master
processor must transmit a block of data to one of several
slaves, it first sends out an address byte that identifies the
target slave. An address byte differs from a data byte in that
the ninth bit is 1 in an address byte and 0 in a data byte. With
SM2 = 1, no slave is interrupted by a data byte. An address
byte, however, interrupts all slaves, so that each slave can
examine the received byte and see if it is being addressed.
The addressed slave clears its SM2 bit and prepares to
receive the data bytes that follows. The slaves that are not
addressed set their SM2 bits and ignore the data bytes.
SM2 has no effect in Mode 0 but can be used to check the
validity of the stop bit in Mode 1. In a Mode 1 reception, if
SM2 = 1, the receive interrupt is not activated unless a valid
stop bit is received.
Baud Rates
The baud rate in Mode 0 is fixed as shown in the following
equation.
Mode 0 Baud Rate = Oscillator Frequency
12
The baud rate in Mode 2 depends on the value of the SMOD
bit in Special Function Register PCON. If SMOD = 0 (the
value on reset), the baud rate is 1/64 of the oscillator
frequency. If SMOD = 1, the baud rate is 1/32 of the
oscillator frequency, as shown in the following equation.
Mode 2 Baud Rate = 2
SMOD
x (Oscillator Frequency)
64
In the IC80C51/31, the Timer 1 overflow rate da termines
th e baud rates in Modes 1 and 3. In the IC80C52/32, these
baud rates can be determined by Timer 1, Timer 2, or both
(one for transmit and the other for receive).
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PDF描述 |
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| IC80C32-12W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-24PL | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-24PQ | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IC80C32-12W | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-24PL | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-24PQ | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-24W | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| IC80C32-40PL | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
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