參數(shù)資料
型號： AT89S8253-24AC
廠商： Atmel
文件頁數(shù)： 10/60頁
文件大?。?/td> 0K
描述： IC 8051 MCU FLASH 12K 44TQFP
標準包裝： 160
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(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 12KB（12K 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)： 2.7 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 44-TQFP
包裝： 托盤
18
3286P–MICRO–3/10
AT89S8253
Figure 10-4. Timer 2 in Baud Rate Generator Mode
11. Baud Rate Generator
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table
10-2). 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 Figure 10-4.
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 fol-
lowing equation.
The Timer can be configured for either timer or counter operation. In most applications, it is con-
figured 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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AT89S8253-24AU SL383 制造商:Atmel Corporation 功能描述:MCU 8-bit AT89 80C51 CISC 12KB Flash 3.3V/5V 44-Pin TQFP T/R
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AT89S825324JI 制造商:Atmel Corporation 功能描述:
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