ST92T141K4M6 STMicroelectronics, ST92T141K4M6 Datasheet - Page 124
ST92T141K4M6
Manufacturer Part Number
ST92T141K4M6
Description
Microcontrollers (MCU) OTP EPROM 16K SPI
Manufacturer
STMicroelectronics
Datasheet
1.ST92T141K4B6.pdf
(179 pages)
Specifications of ST92T141K4M6
Data Bus Width
8 bit, 16 bit
Program Memory Type
EPROM
Program Memory Size
16 KB
Data Ram Size
512 B
Interface Type
SPI
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
15
Number Of Timers
2
Operating Supply Voltage
4.5 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SO-34
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit, 6 Channel
Lead Free Status / Rohs Status
No
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ST92141 - 3-PHASE INDUCTION MOTOR CONTROLLER (IMC)
INDUCTION MOTOR CONTROLLER (Cont’d)
7.4.7 NMI management
Figure 71
is managed by the IMC peripheral.
After an ST9 reset, the NMIE bit in the PCR1 reg-
ister is cleared, which means that NMI signal com-
ing from the external pin is sent, as is, to the ST9
core without affecting the IMC peripheral.
If the NMIE bit is set, when an NMI event occurs
on the external pin, it will be acknowledged (de-
pending on the value of the NMIL bit in the PSR
register). In this case:
– The NMI bit in the IMCIVR register is set
– The dedicated output pins of the IMC are put in
– A high level signal is sent to the ST9 Top Level
– The OPE bit is cleared (as the NMI interrupt sig-
Figure 71. NMI management by the IMC peripheral
124/179
high impedance
interrupt
nal is no longer active)
9
shows how the external input NMI signal
NMI to ST9 core
NMI from EXT pin
0
1
NMIE
bit
Notes:
1. Because the signal to the ST9 top level interrupt
is active high, the TLTEV bit in the EIVR register
must be set.
2. When the user wants to leave the NMI interrupt
routine, it is strongly recommended to verify, be-
fore leaving the routine, that the NMI pending bit
(bit 3 of IMCIVR) is really at “0”. To do this, the
user can try to write the NMI pending bit to “0” re-
peatedly until it has successfully been cleared.
The NMI pending bit in IMCIVR register can be
written to “0” only if the external NMI signal is no
longer active. This makes sure that no NMI event
will be lost. If the user leaves the NMI interrupt rou-
tine without clearing the NMI pending bit, no other
NMI interrupt can be issued afterwards because
the ST9 top level interrupt is edge sensitive.
selection
Level
NMIL
bit
NMI
bit
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