ST7MC2S6 STMicroelectronics, ST7MC2S6 Datasheet - Page 197
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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)
If the PCN bit is reset, one of the three PWM sig-
nals (the one set by the compare U register pair) or
the output of the measurement window generator
(depending on if the driving mode is voltage or cur-
rent) is used to provide six-step signals through
the PWM manager (to drive a PM BLDC motor for
instance).
In that case, DTE behaves like a standard bit (with
multiple write capability). When the deadtime gen-
erator is enabled (bit DTE=1), some restrictions
are applied, summarized in
■
■
■
Table 53
time generator when the PCN bit is reset. 1(pwm*)
means that the corresponding channel is active (1
in the corresponding bit in the MPHST register),
and a PWM signal is applied on it (using the MPAR
register and the OS[2:0] bits in MCRB register).
PWM represents the complementary signals (al-
though the duty cycle is slightly different due to
deadtime insertion). 0 means that the channel is
inactive and 1 means that the channel is active
and a logic level 1 is applied on it (no PWM signal).
Channels
Channel[0:1], Channel[2:3], Channel[4:5]; a
deadtime generator is allocated to each of these
pairs (see cautions below);
The input signal of the deadtime generator is the
active output of the PWM manager for the
corresponding channel. For instance, if we
consider the Channel[0:1] pair, it may be either
Channel0 or Channel1.
When both channels of a pair are inactive, the
corresponding outputs will also stay inactive
(this is mandatory to allow BEMF zero-crossing
detection).
summarizes the functionality of the dead-
are
now
Table
grouped
53:
by
pairs:
Table 53. Dead Time generator outputs
* PWM generation enabled
Warning: Grouping channels by pairs imposes the
external connections between the MCO outputs
and power devices; the user must therefore pay at-
tention to respect the “recommended schematics”
described in
124
Note: As soon as the channels are grouped in
pairs, special care has to be taken in configuring
the MPAR register for a PM BLDC drive. If both
channels of the same pair are both labelled “high”
for example and if the PWM is applied on high
channels, the active MCO output x (OOx=1 bit in
the MPHST register) outputs PWM and the paired
MCO output x+1 (OOx+1bit in the MPHST regis-
ter) outputs PWM and vice versa.
Caution: When PCN=0 and a complementary
PWM is applied (DTE=1) on one channel of a pair,
if both channels are active, this corresponds in
output to both channels OFF. This is for security
purpose to avoid cross-conduction.
Caution: To clear the DTE bit from reset state of
MDTG register (FFh), the PCN bit must be cleared
before.
(OOx bit)
1 (pwm*)
1 (pwm*)
On/Off x
0
1
1
0
0
PCN = 0; DTE =1; x= 0, 2, 4
(OOx+1 bit)
On/Off x+1
Figure 123. on page 228
1 (pwm*)
1 (pwm*)
0
1
0
1
0
ST7MC1xx/ST7MC2xx
MCOx output
PWM
PWM
0
0
1
0
0
and
MCOx+1
output
PWM
PWM
197/309
0
0
0
1
0
Figure
1
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