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| 型號： | EVAL-ADUC831QSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 53/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV FOR ADUC831 QUICK START |
| 產(chǎn)品培訓(xùn)模塊： | Process Control |
| 標準包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | ADuC831 |
| 所含物品： | 評估板、電源、纜線、軟件和說明文檔 |
| 產(chǎn)品目錄頁面： | 739 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | ADUC831BCPZ-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC831BCPZ-REEL-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC831BSZ-REEL-ND - IC MCU 62K FLASH ADC/DAC 52MQFP ADUC831BSZ-ND - IC ADC/DAC 12BIT W/MCU 52-MQFP |
| 其它名稱： | EVAL-ADUC831QS EVAL-ADUC831QS-ND |
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REV. 0
ADuC831
–57–
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:
Modes
and
Baud Rate =
(/
) (Timer
Overflow Rate)
SMOD
13
232
1
×
The Timer 1 interrupt should be disabled in this application. The
Timer itself can be configured for either timer or counter opera-
tion, 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 = 0010 binary). In that case, the baud
rate is given by the formula:
Modes
and
Baud Rate =
/
Core Clock / (
– TH
SMOD
13
() (
[
]))
232
12
256
1
××
Table XXIV shows some commonly used baud rates and how they
might be calculated from a core clock frequency of 11.0592 MHz
and 12 MHz. Generally speaking, a 5% error is tolerable using
asynchronous (start/stop) communications.
Table XXIV. Commonly-Used Baud Rates, Timer 1
Core
Ideal
CLK
SMOD
TH1-Reload
Actual
%
Baud
(MHz)
Value
Baud
Error
9600
12
1
–7
(F9H)
8929
7
19200
11.0592
1
–3
(FDH)
19200
0
9600
11.0592
0
–3
(FDH)
9600
0
2400
11.0592
0
–12 (F4H)
2400
0
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 using
Timer 2.
Modes
and
Baud Rate = ( /
) (Timer
Overflow Rate)
13
116
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 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 53.
In this case, the baud rate is given by the formula:
Modes 1 and 3 Baud Rate =
(Core Clk)/ (
– RCAP H, RCAP L
32
65536
2
× [(
)])
Table XXV shows some commonly used baud rates and how they
might be calculated from a core clock frequency of 11.0592 MHz
and 12 MHz.
Table XXV. Commonly Used Baud Rates, Timer 2
Core
Ideal
CLK
RCAP2H
RCAP2L
Actual %
Baud
(MHz)
Value
Baud
Error
19200
12
–1 (FFH)
–20
(ECH)
19661
2.4
9600
12
–1 (FFH)
–41
(D7H)
9591
0.1
2400
12
–1 (FFH)
–164 (5CH)
2398
0.1
1200
12
–2 (FEH)
–72
(B8H)
1199
0.1
19200
11.0592
–1 (FFH)
–18
(EEH)
19200
0
9600
11.0592
–1 (FFH)
–36
(DCH)
9600
0
2400
11.0592
–1 (FFH)
–144 (70H)
2400
0
1200
11.0592
–2 (FFH)
–32
(E0H)
1200
0
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
RCAP2L
RCAP2H
TIMER 2
OVERFLOW
2
16
RCLK
TCLK
RX
CLOCK
TX
CLOCK
0
1
0
SMOD
TIMER 1
OVERFLOW
C/
T2 = 0
C/
T2 = 1
NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12.
Figure 53. Timer 2, UART Baud Rates
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