ST7MC2S6 STMicroelectronics, ST7MC2S6 Datasheet - Page 157
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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)
10.6.6.7 Protection for Z
To avoid an erroneous detection of a hardware
zero-crossing event, a filter can be enabled by set-
ting the PZ bit in the MCRA register. This filter will
ensure the detection of a Z
transition between D event and Z
Without this protection, Z
directly on the current sample in comparison with
the expected state at the output of the phase com-
parator. For example, if a falling edge transition
(meaning a transition from 1 to 0 at the output of
the phase comparator) is configured for Z
through the CPB bit in MCRB register, then, the
state 0 is expected at the comparator output and
Figure 83. Protection of Z
Phase
Comparator
+
-
V
I
Fz
C
Sampling clock
H
H
Instantaneous
edge
event detection is done
Current sample
H
D
CP
event detection
H
C Rz
event detection
S
R
event on an edge
Q
Q
H
event.
D
CP
H
event
S
R
D
CP
Previous sample
Q
Q
S
R
Q
Q
once this state is detected, the Z
ated without any verification that the state at the
comparator output of the previous sample was 1.
The purpose of this protection filter is to be sure
that the state of the comparator output at the sam-
ple before was really the opposite of the current
state which is generating the Z
filter, the Z
transition level comparison.
This filter is not needed in sensor mode (SR=1)
and for simulated zero-crossing event (Z
ation.
When the PZ bit is set, the Z event filter ZEF[3:0] in
the MZFR register is ignored.
Rz
Fz
H
event generation is done on edge
ST7MC1xx/ST7MC2xx
Falling/Rising Edge
MCRB register MPOL register
V Voltage mode
I Current mode
Rz Rising edge zero-crossing
Fz Falling edge zero-crossing
C Commutation event
CPB* bit
Direct/Filter PZ
MCRA register
bit 1
H
H
F
D
event. With this
event is gener-
ZVD bit
S
) gener-
157/309
Z
1
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