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參數(shù)資料
| 型號： | Q67121-C900 |
| 廠商： | SIEMENS AG |
| 英文描述： | 16-Bit CMOS Single-Chip Microcontroller |
| 中文描述： | 16位CMOS單芯片微控制器 |
| 文件頁數(shù)： | 35/69頁 |
| 文件大?。?/td> | 1124K |
| 代理商： | Q67121-C900 |
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Semiconductor Group
35
1997-07-01
C515C
Timer 2 Operating Modes
The timer 2, which is a 16-bit-wide register, can operate as timer, event counter, or gated timer. A
roll-over of the count value in TL2/TH2 from all 1’s to all 0’s sets the timer overflow flag TF2 in SFR
IRCON, which can generate an interrupt. The bits in register T2CON are used to control the timer
2 operation.
Timer Mode : In timer function, the count rate is derived from the oscillator frequency. A prescaler
offers the possibility of selecting a count rate of 1/6 or 1/12 of the oscillator frequency.
Gated Timer Mode : In gated timer function, the external input pin T2 (P1.7) functions as a gate to
the input of timer 2. lf T2 is high, the internal clock input is gated to the timer. T2 = 0 stops the
counting procedure. This facilitates pulse width measurements. The external gate signal is sampled
once every machine cycle.
Event Counter Mode : In the event counter function. the timer 2 is incremented in response to a 1-
to-0 transition at its corresponding external input pin T2 (P1.7). In this function, the external input is
sampled every machine cycle. Since it takes two machine cycles (12 oscillator periods) to recognize
a 1-to-0 transition, the maximum count rate is 1/6 of the oscillator frequency. There are no
restrictions on the duty cycle of the external input signal, but to ensure that a given level is sampled
at least once before it changes, it must be held for at least one full machine cycle.
Reload of Timer 2 : Two reload modes are selectable:
In mode 0, when timer 2 rolls over from all 1’s to all 0’s, it not only sets TF2 but also causes the timer
2 registers to be loaded with the 16-bit value in the CRC register, which is preset by software.
In mode 1, a 16-bit reload from the CRC register is caused by a negative transition at the correspon-
ding input pin P1.5/T2EX. This transition will also set flag EXF2 if bit EXEN2 in SFR IEN1 has been
set.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Q67121-C923 | C16x-Family of High-Performance CMOS 16-Bit Microcontrollers |
| Q67121-C942 | 16-Bit CMOS Single-Chip Microcontroller |
| Q67121-C946 | 16-Bit CMOS Single-Chip Microcontroller |
| Q67121-C967 | 16-Bit CMOS Single-Chip Microcontroller |
| Q67126-C2001 | 8-Bit CMOS Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Q67121-C923 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:C16x-Family of High-Performance CMOS 16-Bit Microcontrollers |
| Q67121-C942 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontroller |
| Q67121-C946 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontroller |
| Q67121-C967 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontroller |
| Q67126-C2001 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
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