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參數(shù)資料
| 型號(hào)： | ST52513F3 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PDSO20 |
| 封裝： | ROHS COMPLIANT, SOP-20 |
| 文件頁(yè)數(shù)： | 109/136頁(yè) |
| 文件大?。?/td> | 2791K |
| 代理商： | ST52513F3 |
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Figure 12.2 Timer 0 External Start/Stop Mode
TxSTRT signal starts/stops the Timer from
counting only if the peripherals are configured in
Timer mode. The Timers are started by writing 1 in
the TXSTRT bit of the PWMx_CR1 and are
stopped by writing 0. This signal can be generated
internally and/or externally by forcing the TSTRT
pin (only TIMER0).
TIMER 0 START/STOP can be given externally on
the TSTRT pin. In this case, the T0STRT signal
allows the user to work in two different configurable
modes (see Figure 12.2):
■ LEVEL (Time Counter): If the T0STRT signal is
high, the Timer starts counting. When the
T0STRT is low the timer stops counting and the
16-bit current value is stored in the
PWM0_COUNT_IN_x Input Registers couple.
■ EDGE (Period Counter): After reset, on the first
T0STRT rising edge, TIMER 0 starts counting
and at the next rising edge it stops. In this
manner the period of an external signal may be
measured.
The same above mentioned modes, can be used
to reset the Timer0 by using the TRES pin signal.
The polarity of the T0SRTR Start/Stop signal can
be changed by setting the STRPOL and RESPOL
bits in the INT_POL Configuration Register (01h bit
3 and 4). When these bits are set, the PWM/Timer
0 is Started/Set on the low level or in the falling
edge of the signal applied in the pins.
The Timer output signal, TxOUT, is a signal with a
frequency equal to the one of the 16 bit-Prescaler
output signal, PRESCOUTx, divided by a 16-bit
counter set by writing the Output Register couple
PWMx_COUNT_OUT_x.
Note: the contents of these registers upgrades the
Timer counter after it stops counting. Since the
register couple is written in two steps this can
cause side effects. In order to avoid this, the user
should write the MSB before writing the LSB:
actually, the 16-bit value is latched in parallel when
the LSB is written. By writing only the LSB (and
MSB equal to 0), the PWM/Timer is used as an 8
bit counter.
Warning: in Timer Mode the Reload Register
couple PWMx_RELOAD_x (see PWM mode) must
be set to the higher value FFFFh (65535)
otherwise it can affect the count duration.
There can be two types of TxOUT waveforms:
■ type 1: TxOUT waveform equal to a square
wave with a 50% duty-cycle
■ type 2: TxOUT waveform equal to a pulse signal
with the pulse duration equal to the Prescaler
output signal.
Figure 12.3 TxOUT Signal Types
Level
Edge
start
stop
start
stop
start
01
1
0
4
3
2
Reset
Clock
Counted
Value
Timer Output
Type 1
Type 2
Prescout*Counter
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST52513G2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH |
| ST52513G3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH |
| ST52513K2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH |
| ST52513K3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH |
| ST52513Y2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH |
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