參數(shù)資料
型號(hào)： T89C51RD2-SLSIM
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 18/104頁
文件大?。?/td> 798K
代理商： T89C51RD2-SLSIM
18
T89C51RD2
4243G
–
8051
–
05/03
Timer 2
The timer 2 in the T89C51RD2 is compatible with the timer 2 in the 80C52.
It is a 16-bit timer/counter: the count is maintained by two eight-bit timer registers, TH2
and TL2, connected in cascade. It is controlled by T2CON register (See Table 8) and
T2MOD register (See Table 9). Timer 2 operation is similar to Timer 0 and Timer 1. C/T2
selects F
OSC
/12 (timer operation) or external pin T2 (counter operation) as the timer
clock input. Setting TR2 allows TL2 to be incremented by the selected input.
Timer 2 has 3 operating modes: capture, autoreload and Baud Rate Generator. These
modes are selected by the combination of RCLK, TCLK and CP/RL2 (T2CON), as
described in the ATMEL Wireless and Micrcontrollers 8-bit Microcontroller Hardware
description.
Refer to the ATMEL Wireless and Micrcontrollers 8-bit Microcontroller Hardware
description for the description of Capture and Baud Rate Generator Modes.
In T89C51RD2 Timer 2 includes the following enhancements:
Auto-reload mode with up or down counter
Programmable clock-output
Auto-Reload Mode
The auto-reload mode configures timer 2 as a 16-bit timer or event counter with auto-
matic reload. If DCEN bit in T2MOD is cleared, timer 2 behaves as in 80C52 (refer to the
ATMEL Wireless and Micrcontrollers 8-bit Microcontroller Hardware description). If
DCEN bit is set, timer 2 acts as an Up/down timer/counter as shown in Figure 5. In this
mode the T2EX pin controls the direction of count.
When T2EX is high, timer 2 counts up. Timer overflow occurs at FFFFh which sets the
TF2 flag and generates an interrupt request. The overflow also causes the 16-bit value
in RCAP2H and RCAP2L registers to be loaded into the timer registers TH2 and TL2.
When T2EX is low, timer 2 counts down. Timer underflow occurs when the count in the
timer registers TH2 and TL2 equals the value stored in RCAP2H and RCAP2L registers.
The underflow sets TF2 flag and reloads FFFFh into the timer registers.
The EXF2 bit toggles when timer 2 overflows or underflows according to the the direc-
tion of the count. EXF2 does not generate any interrupt. This bit can be used to provide
17-bit resolution.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T89C51RD2-SLSI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLTC-L 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLTC-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLTI-L 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLTI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
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