參數(shù)資料
型號: AT89S8252-24PI
廠商: Atmel
文件頁數(shù): 7/41頁
文件大?。?/td> 0K
描述: MCU W/SPI 8KB FLSH 2K EEP 40-DIP
標準包裝: 9
系列: 89S
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: SPI,UART/USART
外圍設備: POR,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
其它名稱: AT89S825224PI
15
AT89S8252
0401G–MICRO–3/06
Figure 4. Timer 2 in Baud Rate Generator Mode
Baud Rate Generator
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON
(Table 2). Note that the baud rates for transmit and receive can be different if Timer 2
is used for the receiver or transmitter and Timer 1 is used for the other function.
Setting RCLK and/or TCLK puts Timer 2 into its baud rate generator mode, as shown in
The baud rate generator mode is similar to the auto-reload mode, in that a rollover in
TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers
RCAP2H and RCAP2L, which are preset by software.
The baud rates in Modes 1 and 3 are determined by Timer 2’s overflow rate according to
the following equation.
The Timer can be configured for either timer or counter operation. In most applications,
it is configured for timer operation (CP/T2 = 0). The timer operation is different for Timer
2 when it is used as a baud rate generator. Normally, as a timer, it increments every
machine cycle (at 1/12 the oscillator frequency). As a baud rate generator, however, it
increments every state time (at 1/2 the oscillator frequency). The baud rate formula is
given below.
where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
OSC
SMOD1
RCLK
TCLK
Rx
CLOCK
Tx
CLOCK
T2EX PIN
T2 PIN
TR2
CONTROL
"1"
"0"
TIMER 1 OVERFLOW
NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12
TIMER 2
INTERRUPT
2
16
RCAP2L
RCAP2H
TH2
TL2
C/T2 = 0
C/T2 = 1
EXF2
CONTROL
TRANSITION
DETECTOR
EXEN2
÷
Modes 1 and 3 Baud Rates
Timer 2 Overflow Rate
16
------------------------------------------------------------
=
Modes 1 and 3
Baud Rate
---------------------------------------
Oscillator Frequency
32
65536
RCAP2H,RCAP2L
()
[]
×
----------------------------------------------------------------------------------------------
=
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