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参数资料
型号： ST72T141K2MAE
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
封装： 0.300 INCH, LEAD FREE, PLASTIC, SOP-34
文件页数： 84/131页
文件大小： 3096K
代理商： ST72T141K2MAE
ST72141K2-Auto
56/131
MOTOR CONTROLLER (Cont’d)
Table 19. MTIM Timer-related Registers
Note on using the auto-updated MTIM timer:
The auto-updated MTIM timer works accurately
within its operating range but some care has to be
taken when processing timer-dependent data such
as the step duration for regulation or demagnetiza-
tion.
For example, if an overflow occurs when calculat-
ing
a
software
end
of
demagnetization
(MCOMP+demagnetization_time>FFh), the value
that is stored in MDREG will be:
7Fh+(MCOMP+demagnetization_time-FFh)/2.
Note on commutation interrupts: It is good prac-
tice to modify the configuration for the next step as
soon as possible, that is, within the commutation
interrupt routine.
All registers that need to be changed at each step
have a preload register that enables the modifica-
tions for a complete new configuration to be per-
formed at the same time (at C event in normal
mode or when writing the MPHST register in direct
access mode).
These configuration bits are:
CPB, HDM, SDM and OS2 in the MCRB register
and IS[1:0], OO[5:0] in the MPHST register.
Note on initializing the MTC: As shown in Table
21 all the MTIM timer registers are in read-write
mode until the MTC clock is enabled (with the
MOE and DAC bits). This allows the timer, prescal-
er and compare registers to be properly initialized
for start-up.
In sensorless mode, the motor has to be started in
switched mode until a BEMF voltage is present on
the inputs. This means the prescaler ST[3:0] bits
and MCOMP register have to be modified by soft-
ware. When running the ST[3:0] bits can only be
incremented/decremented, so the initial value is
very important.
When starting directly in autoswitched mode (in
sensor mode for example), write an appropriate
value in the MZREG and MZPRV register to per-
form a step calculation as soon as the clock is en-
abled.
Name
Reset Value
Contents
MTIM
00h
Timer Value
MZPRV
00h
Capture Zn-1
MZREG
00h
Capture Zn
MCOMP
00h
Compare Cn+1
MDREG
00h
Demagnetization Dn
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