ST7MC1 datasheet(183/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

Three kinds of interrupt can be generated in

Speed Sensor Mode, as summarized in Figure

104:

– C interrupt, when a capture event occurs; this in-

terrupt shares resources (Mask bit and Flag) with

the Commutation event in Switched/Au-

toswitched Mode, as these modes are mutually

exclusive.

– RPI/RMI interrupts occur when the ST[3:0] bits of

the MPSR register are changed, either automat-

ically or by hardware.

– S interrupt occurs when a Speed Error happens

(i.e. a successful comparison between

[MTIM:MTIML] and [MDREG:FF]). This interrupt

has the same channel as the Emergency Stop in-

terrupt (MCES), as it also warns the user about

abnormal system operation. The respective Flag

bits have to be tested in the interrupt service rou-

tine to differentiate Speed Errors from Emergen-

cy Stop events.

These interrupts may be masked individually.

Note on Delay Manager Initialization in Speed

Measurement Mode: In order to set-up the

[MTIM:MTIML] counter properly before any speed

measurement, the following procedure must be

applied:

– The peripheral clock must be disabled (resetting

the CKE bit in the MCRA register) to allow write

access to ST[3:0], MTIM and MTIML (refer to Ta-

ble 41),

– MTIM, MTIML must be reset and appropriate val-

ues must be written in the ST[3:0] prescaler

adapt to the frequency of the signal being meas-

ured and to allow speed measurement with suffi-

cient resolution.

Note on MTIML: The Least Significant Byte of the

counter (MTIML) is not used when working in Po-

sition Sensor or Sensorless Modes.

Debug option: a signal reflecting the capture

events may be output on a standard I/O port for de-

bugging purposes. Refer to section10.6.7.3 on

page 171 for more details.

Figure 104. Prescaler auto-change example

RPI

RMI

CAPTURE

FFFFh

FAFFh

8000h

5500h

EVENTS

USUAL

WORKING

RANGE

RPI

Events:

Capture

Speed Error

Ratio Increment

RMI Ratio Decrement

Notes:

[MTIM:MTIML]

[MTIM:MTIML] Input Clock:

Fx / 2

(ST[3:0] = n)

(ST[3:0] = n+1)

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