ST7FMC1K2B3 STMICROELECTRONICS [STMicroelectronics], ST7FMC1K2B3 Datasheet - Page 209

• Manufacturer Part Number: ST7FMC1K2B3
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

MOTOR CONTROLLER (Cont’d)
INTERRUPT STATUS REGISTER (MISR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7 = PUI: PWM Update Interrupt flag.
This bit is set by hardware when all the PWM
Compare register are transferred from the preload
to the active registers. The corresponding interrupt
allows the user to refresh the preload registers be-
fore the next PWM update event defined with
MREP register.
0: No PWM Update interrupt pending
1: PWM Update Interrupt pending
Bit 6 = RPI: Ratio Increment interrupt flag.
Autoswitched mode (SWA bit =1):
0: No R+ interrupt pending
1: R+ Interrupt pending
Switched mode (SWA bit =0):
0: No R+ action
1: The hardware will increment the ST[3:0] bits
Speed Sensor mode (SWA bit =x, TES[1:0] bits
=01, 10, 11):
0: No R+ interrupt pending
1: R+ Interrupt pending
Bit 5 = RMI: Ratio Decrement interrupt flag.
Autoswitched mode (SWA bit =1):
0: No R- interrupt pending
1: R- Interrupt pending
Switched mode (SWA bit =0):
0: No R- action
1: The hardware will decrement the ST[3:0] bits
Speed Sensor mode (SWA bit =x, TES[1:0] bits
=01, 10, 11):
0: No R- interrupt pending
1: R- Interrupt pending
Bit 4 = CLI: Current Limitation interrupt flag.
0: No Current Limitation interrupt pending
1: Current Limitation interrupt pending
Bit 3 = EI: Emergency stop Interrupt flag.
0: No Emergency stop interrupt pending
PUI
when the next commutation occurs and shift all
timer registers right.
when the next commutation occurs and shift all
timer registers left.
7
RPI
6
RMI
5
CLI
4
EI
3
ZI
2
DI
1
CI
0
1: Emergency stop interrupt pending
Bit 2 = ZI: BEMF Zero-crossing interrupt flag.
0: No BEMF Zero-crossing Interrupt pending
1: BEMF Zero-crossing Interrupt pending
Bit 1 = DI: End of Demagnetization interrupt flag.
0: No End of Demagnetization interrupt pending
1: End of Demagnetization interrupt pending
Bit 0 = CI: Commutation / Capture interrupt flag
0: No Commutation / Capture Interrupt pending
1: Commutation / Capture Interrupt pending
Note 1: Loading value FFh in the MISR register
will reset the PWM generator counter and transfer
the compare preload registers in the active regis-
ters by generating a U event (PUI bit set to 1). Re-
fer to
Note 2: When several MTC interrupts are enabled
at the same time the BRES instruction must not be
used to avoid unwanted clearing of status flags: if
a second interrupt occurs while BRES is executed
(which performs a read-modify-write sequence) to
clear the flag of a first interrupt, the flag of the sec-
ond interrupt may also be cleared and the corre-
sponding interrupt routine will not be serviced. It is
thus recommended to use a load instruction to
clear the flag, with a value equal to the logical
complement of the bit. For instance, to clear the
PUI flag:
ld MISR, # 0x7F.
Note 3: In Autoswitched mode (SWA=1 in the
MRCA register): As all bits in the MISR register are
status flags, they are set by internal hardware sig-
nals and must be cleared by software. Any attempt
to write them to 1 will have no effect (they will be
read as 0) without interrupt generation.
In Switched mode (SWA=0 in the MRCA regis-
ter):
To avoid any losing any interrupts when modifying
the RMI and RPI bits the following instruction se-
quence is recommended:
ld MISR, # 0x9F ; reset both RMI & RPI bits
ld MISR, # 0xBF ; set RMI bit
ld MISR, # 0xDF ; set RPI bit
“Timer Re-synchronisation” on page
ST7MC1xx/ST7MC2xx
206.
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