ST72251 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST72251
STMicroelectronics
ST72251 Datasheet PDF : 100 Pages
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ST72251
16-BIT TIMER (Cont’d)
5.3.4 Low Power Modes
Mode
WAIT
HALT
Description
No effect on 16-bit Timer.
Timer interrupts cause the device to exit from WAIT mode.
16-bit Timer registers are frozen.
In HALT mode, the counter stops counting until Halt mode is exited. Counting resumes from the previous
count when the MCU is woken up by an interrupt with “exit from HALT mode” capability or from the counter
reset value when the MCU is woken up by a RESET.
If an input capture event occurs on the ICAPi pin, the input capture detection circuitry is armed. Consequent-
ly, when the MCU is woken up by an interrupt with “exit from HALT mode” capability, the ICFi bit is set, and
the counter value present when exiting from HALT mode is captured into the ICiR register.
5.3.5 Interrupts
Interrupt Event
Input Capture 1 event/Counter reset in PWM mode
Input Capture 2 event
Output Compare 1 event (not available in PWM mode)
Output Compare 2 event (not available in PWM mode)
Timer Overflow event
Event
Flag
ICF1
ICF2
OCF1
OCF2
TOF
Enable
Control
Bit
ICIE
OCIE
TOIE
Exit
from
Wait
Yes
Yes
Yes
Yes
Yes
Exit
from
Halt
No
No
No
No
No
Note: The 16-bit Timer interrupt events are connected to the same interrupt vector (see Interrupts chap-
ter). These events generate an interrupt if the corresponding Enable Control Bit is set and the interrupt
mask in the CC register is reset (RIM instruction).
5.3.6 Summary of Timer modes
MODES
Input Capture (1 and/or 2)
Output Compare (1 and/or 2)
One Pulse mode
PWM Mode
Input Capture 1
Yes
Yes
No
No
AVAILABLE RESOURCES
Input Capture 2 Output Compare 1 Output Compare 2
Yes
Yes
Yes
Yes
Yes
Not Recommended1)
No
Not Recommended3)
No
Yes
Partially 2)
No
1) See note 4 in Section 5.3.3.5 One Pulse Mode
2) See note 5 in Section 5.3.3.5 One Pulse Mode
3) See note 4 in Section 5.3.3.6 Pulse Width Modulation Mode
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