ST7MC1K2 datasheet(232/371 Pages) STMICROELECTRONICS

232 / 371 page

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Figure 104. Auto-updated prescaler functional diagram

Three kinds of interrupt can be generated in Speed sensor mode, as summarized in

Figure 105:

●

C interrupt, when a capture event occurs; this interrupt shares resources (mask bit and

flag) with the commutation event in switched/autoswitched mode, as these modes are

mutually exclusive.

●

RPI/RMI interrupts occur when the ST[3:0] bits of the MPSR register are changed,

either automatically or by hardware.

●

S interrupt occurs when a speed error happens (that is, a successful comparison

between [MTIM:MTIML] and [MDREG:FF]). This interrupt has the same channel as the

emergency stop interrupt (MCES), as it also warns the user about abnormal system

operation. The respective flag bits have to be tested in the interrupt service routine to

differentiate speed errors from emergency stop events.

These interrupts may be masked individually.

Note:

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:

1. 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 Table 99)

2. MTIM, MTIML must be reset and appropriate values must be written in the ST[3:0]

prescaler adapt to the frequency of the signal being measured and to allow speed

measurement with sufficient resolution.

Note:

MTIML: The least significant byte of the counter (MTIML) is not used when working in

position sensor or sensorless modes.

Debug option

A signal reflecting the capture events may be output on a standard I/O port for debugging

purposes. Refer to Debug option on page 219 for more details.

Ratio > 0?

Ratio = Ratio -1

Counter = 0

Begin

End

Yes

Capture with [MTIM:MTIML] timer < 5500h

Ratio < Fh?

Ratio = Ratio + 1

Counter = Counter/2

Begin

End

Yes

[MTIM:MTIML] timer overflow

Slow-down control

Speed-up control

(MTIM = MTIML = FFh)

(MZREG < 55h)

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