參數(shù)資料
型號: ST52X420
廠商: 意法半導(dǎo)體
元件分類: ADC
英文描述: 8-BIT INTELLIGENT CONTROLLER UNIT (ICU) Three Timer/PWMs, ADC, WDG
中文描述: 8位智能控制器病房(ICU)3個定時器/的PWM,ADC的,水分散粒劑
文件頁數(shù): 54/84頁
文件大?。?/td> 1274K
代理商: ST52X420
ST52T410/ST52T420/E420
54/84
Figure 10.4 PWM Mode with Auto Reload
LEVEL (Time Counter)
: If the T0STRT signal is
high the Timer starts counting. When T0STRT is
low the counting ceases and the current value is
stored in the PWM_0_COUNT Input Register.
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.
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), which is the value to count.
There can be two types of TIMERxOUT waveform:
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 Table 10.2, Table
10.5 and Table 10.7)
WARNING:
in
Timer
PWM_x_RELOAD output register (see below)
must be set to 0.
Mode
the
10.2 PWM Mode
For each timer, PWM working mode is obtained by
setting the correspondent TxMODE bits of
REG_CONF5, REG_CONF8 and REG_CONF10
registers to 1 (see Table 10.1, Table 10.4 and
Table 10.6).
REMARK: The first period of the TxOUT signal
is shorter than the other periods for a time
interval which is [0.5*TMRCLK-CLKM].
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 the
TxOUT pin and the TIMERxOUT inverted signal
can be available on the TxOUT pin by setting the
PxSL bits of REG_CONF12 and REG_CONF16
(see Table 10.8 and Table 10.9)
t
t
255
compare
value
reload
register
0
PWM
Output
Ton
T
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