參數(shù)資料
型號(hào)： ST72F651AR6T1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件頁數(shù)： 138/161頁
文件大?。?/td> 2656K
代理商： ST72F651AR6T1
ST72651AR6
78/161
Doc ID 7215 Rev 4
16-BIT TIMER (Cont’d)
16-bit read sequence: (from either the Counter
Register or the Alternate Counter Register).
The user must read the MS Byte first, then the LS
Byte value is buffered automatically.
This buffered value remains unchanged until the
16-bit read sequence is completed, even if the
user reads the MS Byte several times.
After a complete reading sequence, if only the
CLR register or ACLR register are read, they re-
turn the LS Byte of the count value at the time of
the read.
Whatever the timer mode used an overflow occurs
when the counter rolls over from FFFFh to 0000h
then:
– The TOF bit of the SR register is set.
– A timer interrupt is generated if:
– TOIE bit of the CR1 register is set and
– I bits of the CC register is cleared.
If one of these conditions is false, the interrupt re-
mains pending to be issued as soon as they are
both true.
Clearing the overflow interrupt request is done in
two steps:
1. Reading the SR register while the TOF bit is set.
2. An access (read or write) to the CLR register.
Notes: The TOF bit is not cleared by accesses to
ACLR register. The advantage of accessing the
ACLR register rather than the CLR register is that
it allows simultaneous use of the overflow function
and reading the free running counter at random
times (for example, to measure elapsed time) with-
out the risk of clearing the TOF bit erroneously.
The timer is not affected by WAIT mode.
In HALT mode, the counter stops counting until the
mode is exited. Counting then resumes from the
previous count (MCU awakened by an interrupt) or
from the reset count (MCU awakened by a Reset).
is buffered
Read
At t0
Read
Returns the buffered
LS Byte value at t0
At t0 +
Δt
Other
instructions
Beginning of the sequence
Sequence completed
LS Byte
MS Byte
1
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