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參數(shù)資料
| 型號： | ST52E430B/D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32 |
| 封裝： | WINDOWED, SHRINK, CERAMIC, DIP-32 |
| 文件頁數(shù)： | 67/120頁 |
| 文件大?。?/td> | 502K |
| 代理商： | ST52E430B/D |
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ST52T430/E430
t
255
compare
value
reload
register
0
PWM
Output
Ton
T
Fig. 9.4 PWM Mode with Auto Reload
EDGE(Period Counter): After the reset, on the
first T0STRT rising edge, the TIMER 0 starts the
counting and, at the next rising edge, it is stopped.
In this way it is possible to measure the period of an
external signal.
The Timer x output signal, TIMERxOUT, is a signal
with a frequency equal to the 16 bit-Prescaler x
output signal, TMRCLKx, divided by the Output
Register PWM_x_COUNT value (8 bit) (Output
Registers 3, 5 or 7. See table 2.4), that is the value
to count.
TIMERxOUT waveform can be of two type:
type 1: TIMERxOUT waveform equal to a square
wave with a 50% duty-cycle
type 2: TIMERxOUT waveform equal to a pulse
signal with the pulse duration equal to the
Prescaler x output signal.
For each Timer x, the TIMERxOUT waveform type
can be selected by setting the correspondent
TMRWx bit of REG_CONF6, REG_CONF9 and
REG_CONF11 registers (see tables 9.2, 9.5 and
9.7)
9.2 PWM Mode
The PWM working mode, for each timer, is
obtained by setting at 1 the correspondent
TxMODE bits of REG_CONF5, REG_CONF8 and
REG_CONF10 registers (see tables 9.1, 9.4 and
9.6).
TIMERxOUT, in PWM Mode, consists of a signal,
with a fixed period, whose duty cycle can be
modified by the user.
The TIMERxOUT signal can be available on TxOUT
pin and the TIMERxOUT inverted signal can be
available on TxOUT pin, by setting PxSL bits of
REG_CONF12 and REG_CONF16 (see tables 9.8
and 9.9)
The PWM TIMERxOUT period can be fixed, by
setting the 16-bit prescaler x output and an initial
autoreload 8-bit counter value stored in the Output
Register PWM_x_RELOAD, as shown in figure 9.4.
The Output Register PWM_x_RELOAD value is
automatically reloaded when Counter x restarts to
count.
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