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参数资料
型号： ST7FLITEUS5M6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装： 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件页数： 58/108页
文件大小： 1957K
代理商： ST7FLITEUS5M6
ST7LITEUSx
53/108
12-BIT AUTORELOAD TIMER (Cont’d)
Figure 35. PWM Signal Example
Output Compare Mode
To use this function, the OE bit must be 0, other-
wise the compare is done with the shadow register
instead of the DCRx register. Software must then
write a 12-bit value in the DCR0H and DCR0L reg-
isters. This value will be loaded immediately (with-
out waiting for an OVF event).
The DCR0H must be written first, the output com-
pare function starts only when the DCR0L value is
written.
When the 12-bit upcounter (CNTR) reaches the
value stored in the DCR0H and DCR0L registers,
the CMPF0 bit in the PWM0CSR register is set
and an interrupt request is generated if the CMPIE
bit is set.
Note: The output compare function is only availa-
ble for DCRx values other than 0 (reset value).
Caution: At each OVF event, the DCRx value is
written in a shadow register, even if the DCR0L
value has not yet been written (in this case, the
shadow register will contain the new DCR0H value
and the old DCR0L value), then:
– If OE=1 (PWM mode): the compare is done be-
tween the timer counter and the shadow register
(and not DCRx)
– if OE=0 (OCMP mode): the compare is done be-
tween the timer counter and DCRx. There is no
PWM signal.
The compare between DCRx or the shadow regis-
ter and the timer counter is locked until DCR0L is
written.
10.2.4 Low Power Modes
10.2.5 Interrupts
Note 1: The interrupt events are connected to sep-
arate interrupt vectors (see Interrupts chapter).
They generate an interrupt if the enable bit is set in
the ATCSR register and the interrupt mask in the
CC register is reset (RIM instruction).
Note 2: only if CK0=1and CK1=0
COUNTER
PWM0
OU
TPU
T
t
WITH
OE0=1
AND
O
P
0=
0
FFDh
FFEh
FFFh
FFDh
FFEh
FFFh
FFDh
FFEh
DCR0=FFEh
ATR= FFDh
fCOUNTER
Mode
Description
SLOW
The input frequency is divided
by 32
WAIT
No effect on AT timer
ACTIVE-HALT
AT timer halted except if CK0=1,
CK1=0 and OVFIE=1
HALT
AT timer halted
Interrupt
Event 1)
Event
Flag
Enable
Control
Bit
Exit
from
Wait
Exit
from
Halt
Exit
from
Active-
Halt
Overflow
Event
OVF
OVFIE
Yes
No
Yes2)
CMP Event
CMPFx CMPIE
Yes
No
1
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ST7FLITEUS5U3 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-bit MCU with single voltage Flash memory, ADC, timers
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