ST7MC2S6 STMicroelectronics, ST7MC2S6 Datasheet - Page 189
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ST7MC2S6
Manufacturer Part Number
ST7MC2S6
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
Manufacturer
STMicroelectronics
Datasheet
1.ST7MC1K4.pdf
(309 pages)
Specifications of ST7MC2S6
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators and by-pass for external clock, clock security system.
Four Power Saving Modes
Halt, Active-Halt, Wait and Slow
Main Clock Controller With
Real time base, Beep and Clock-out capabilities
Two 16-bit Timers With
2 input captures, 2 output compares, external clock input, PWM and pulse generator modes
8-bit Pwm Auto-reload Timer With
2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
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MOTOR CONTROLLER (Cont’d)
This sets the minimum off time of the PWM signal
generated by this internal clock. This off time can
vary depending on the output of the current feed-
back comparator. In sensor mode (SR=1) and
when the sampling for the Z event is done during
the PWM ON time in sensorless mode (SPLG bit is
set in MCRC register and /or DS[3:0] bits with a
value other than 000 in MCONF register), there is
no minimum OFF time required anymore, the min-
imum off time is set automatically to 0µs and the
OFF time of the PWM signal is controlled only by
the current regulation loop.
Table 47. Sampling Frequency Selection
Note: Times are indicated for 4 MHz f
Figure 107. Sampling clock generation block
f
SA3 SA2 SA1 SA0
PERIPH
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
MPWME Register
MPRSR Register
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Frequency logic
Off-Time logic
OT[3:0] bits
SA[3:0] bits
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
4
2
Sampling Frequency
33.33 KHz
50.0 KHz
40.0 KHz
25.0 KHz
20.0 KHz
18.1 KHz
15.4 KHz
12.5 KHz
6.25 KHz
3.13 KHz
1.56 KHz
1.25 KHz
10 KHz
961 Hz
625 Hz
390 Hz
It can be configured to 8MHz with the XT16: XT8 bits in the MCONF register
Note: The MTC controller input frequency (
.
PERIPH
Sampling
Clock
0
Warning: If the off time value set is superior than
the period of the PWM signal (for example 40µs off
time for a 50KHz (25µs period) PWM frequency),
then the signal output on MCOx pins selected is a
100% duty cycle signal (always at 1).
Table 48. Off time table
Note: Times are indicated for 4 MHz f
OT3 OT2 OT1 OT0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
The BEMF is sampled at the end of OFF time
in sensorless mode
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
T
T
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
f
off
sampling
PERIPH
(measurement window)
Off Time sen-
sorless mode
(DS[3:0]=0)
ST7MC1xx/ST7MC2xx
Frequency
OFF time
32.5
37.5
12.5 µs
17.5 µs
22.5 µs
27.5 µs
(SR=0)
2.5 µs
7.5 µs
)
35
40
10 µs
15 µs
20 µs
25 µs
30 µs
5 µs
is 4 MHz in this example,
μs
μs
μs
μs
pling during ON
(SR=1) or sam-
time in sensor-
No minimum off
and/or DS[3:0]
less (SPLG =1
Sensor Mode
PERIPH
bits)
time
189/309
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