參數(shù)資料
型號: T89C5115-TISIM
廠商: Atmel
文件頁數(shù): 74/113頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 28SOIC
標(biāo)準(zhǔn)包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 管件
63
AT89C5115
4128G–8051–02/08
Programmable Clock-
Output
In clock-out mode, Timer 2 operates as a 50%-duty-cycle, programmable clock genera-
tor (Figure 30). The input clock increments TL2 at frequency fOSC/2. The timer
repeatedly counts to overflow from a loaded value. At overflow, the contents of RCAP2H
and RCAP2L registers are loaded into TH2 and TL2. In this mode, Timer 2 overflows do
not generate interrupts. The formula gives the clock-out frequency depending on the
system oscillator frequency and the value in the RCAP2H and RCAP2L registers:
For a 16 MHz system clock in x1 mode, Timer 2 has a programmable frequency range
of 61 Hz (fOSC/2
16) to 4 MHz (f
OSC/4). The generated clock signal is brought out to T2 pin
(P1.0).
Timer 2 is programmed for the clock-out mode as follows:
Set T2OE bit in T2MOD register.
Clear C/T2 bit in T2CON register.
Determine the 16-bit reload value from the formula and enter it in RCAP2H/RCAP2L
registers.
Enter a 16-bit initial value in timer registers TH2/TL2. It can be the same as the
reload value or different depending on the application.
To start the timer, set TR2 run control bit in T2CON register.
It is possible to use Timer 2 as a baud rate generator and a clock generator simulta-
neously. For this configuration, the baud rates and clock frequencies are not
independent since both functions use the values in the RCAP2H and RCAP2L registers.
Figure 30. Clock-Out Mode
Clock
OutFrequency
FT
2clock
4
65536
RCAP
2H
RCAP
2L
(
)
×
-----------------------------------------------------------------------------------------
=
EXEN2
EXF2
OVERFLOW
T2EX
TH2
(8-bit)
TL2
(8-bit)
TIMER 2
RCAP2H
(8-bit)
RCAP2L
(8-bit)
T2OE
T2CON reg
T2MOD reg
INTERRUPT
TR2
T2CON.2
FT2
CLOCK
T2
Q
D
Toggle
Q
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T89C5115-TISUM 功能描述:IC 8051 MCU FLASH 16K 28SOIC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:89C 標(biāo)準(zhǔn)包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C,LIN,SPI,UART/USART,USI 外圍設(shè)備:欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT 輸入/輸出數(shù):16 程序存儲器容量:8KB(4K x 16) 程序存儲器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC(0.295",7.50mm 寬) 包裝:帶卷 (TR)
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