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| 型號： | ADUC836BS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, Dual 16-Bit-ADCs with Embedded 62 kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | 14 X 14 MM, MO-022-AC-1, MQFP-52 |
| 文件頁數(shù)： | 59/80頁 |
| 文件大?。?/td> | 5913K |
| 代理商： | ADUC836BS |
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ADuC836
–59–
Timer 2 Generated Baud Rates
Baud rates can also be generated using Timer 2. Using Timer 2 is
similar to using Timer 1 in that the timer must overflow 16 times
before a bit is transmitted/received. Because Timer 2 has a 16-bit
Autoreload mode, a wider range of baud rates is possible.
=
(
Mode1
3
and Mode
Baud Rate
Timer
Overflow Rate
)
×
(
)
1 16
2
Therefore when Timer 2 is used to generate baud rates, the timer
increments every two clock cycles and not every core machine
cycle as before. Thus, it increments six times faster than Timer 1,
and therefore baud rates six times faster are possible. Because
Timer 2 has a 16-bit autoreload capability, very low baud rates
are still possible.
Timer 2 is selected as the baud rate generator by setting the TCLK
and/or RCLK in T2CON. The baud rates for transmit and receive
can be simultaneously different. Setting RCLK and/or TCLK puts
Timer 2 into its baud rate generator mode, as shown in Figure 56.
In this case, the baud rate is given by the formula:
Mode1
3
and Mode
Baud Rate
f
RCAP H L
CORE
=
×
(
)
32
65536
2
Table XXXII shows some commonly used baud rates and
how they might be calculated from a core clock frequency of
1.5728 MHz and 12.5829 MHz using Timer 2.
Table XXXII. Commonly Used Baud Rates, Timer 2
Ideal Core RCAP2H RCAP2L Actual %
Baud CLK Value Value Baud Error
19200 12.58 –1 (FFH) –20 (ECH) 19661 2.4
9600 12.58 –1 (FFH) –41 (D7H) 9591 0.1
1600 12.58 –1 (FFH) –164 (5CH) 2398 0.1
1200 12.58 –2 (FEH) –72 (B8H) 1199 0.1
9600 1.57 –1 (FFH) –5 (FBH) 9830 2.4
1600 1.57 –1 (FFH) –20 (ECH) 1658 2.4
1200 1.57 –1 (FFH) –41 (D7H) 1199 0.1
BAUD RATE GENERATION USING TIMER 1 AND TIMER 2
Timer 1 Generated Baud Rates
When Timer 1 is used as 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 as follows:
(
The Timer 1 interrupt should be disabled in this application.
The timer itself can be configured for either timer or counter
operation, and in any of its three running modes. In the most
typical application, it is configured for timer operation, in the
Autoreload mode (high nibble of TMOD = 0100 binary). In this
case, the baud rate is given by the formula:
Modes1
3
1
and
Baud Rate
Timer
Overflow Rate
SMOD
=
)
×
(
)
2
32
Mode1
3
1
and Mode
Baud Rate
f
TH
SMOD
CORE
=
×
×
)
2
32
12 256
A very low baud rate can also be achieved with Timer 1 by leaving
the Timer 1 interrupt enabled, configuring the timer to run as a
16-bit timer (high nibble of TMOD = 0100 binary), and using
the Timer 1 interrupt to do a 16-bit software reload. Table XXXI
shows some commonly used baud rates and how they might
be calculated from a core clock frequency of 1.5728 MHz and
12.58 MHz using Timer 1. Generally speaking, a 5% error is
tolerable using asynchronous (start/stop) communications.
Table XXXI. Commonly Used Baud Rates, Timer 1
Ideal Core SMOD TH1-Reload Actual %
Baud CLK Value Value Baud Error
9600 12.58 1 –7 (F9H) 9362 2.5
1600 12.58 1 –27 (E5H) 1627 1.1
1200 12.58 1 –55 (C9H) 1192 0.7
1200 1.57 1 –7 (F9H) 1170 2.5
CORE
CLK
*
2
T2
PIN
TR2
CONTROL
TL2
(8 BITS)
TH2
(8 BITS)
RELOAD
EXEN2
CONTROL
T2EX
PIN
TRANSITION
DETECTOR
EXF 2
TIMER 2
INTERRUPT
NOTE AVAILABILITY OF ADDITIONAL
EXTERNAL INTERRUPT
*
THE CORE CLOCK IS THE OUTPUT OF THE PLL (SEE THE ON-CHIP PLL SECTION)
RCAP2L
RCAP2H
TIMER 2
OVERFLOW
2
16
16
RCLK
TCLK
RX
CLOCK
TX
CLOCK
0
0
1
1
1
0
SMOD
TIMER 1
OVERFLOW
C/
T2
= 0
C/
T2
= 1
OSC. FREQ. IS DIVIDED BY 2, NOT 12.
Figure 56. Timer 2, UART Baud Rates
REV. A
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相關代理商/技術參數(shù) |
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| ADUC836BS | 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
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