ST7MC1K2 datasheet(219/371 Pages) STMICROELECTRONICS

219 / 371 page

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On-chip peripherals

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shifted left (multiplied by two). The RMI bit in the MISR register is set and an

interrupt is generated if RIM is set.

–

If the prescaler contents reach the value 0, it can no longer be automatically

decremented, the MTC continues working with the same prescaler value, that is,

with a lower accuracy. No RMI interrupt can be generated.

–

If the prescaler contents reach the value 15, it can no longer be automatically

incremented. When the timer reaches the value FFh, the prescaler and all the

relevant registers remain unchanged and no interrupt is generated, the timer

restarts counting from 0 x 00h and if the TES[1:0] bits = 00, the OI bit in the MCRC

longer set. The PWM is still generated and the D and Z detection circuitry still

work, enabling the capture of the maximum timer value.

The automatically updated registers are: MTIM, MZREG, MZPRV, MCOMP and MDREG.

Access to these registers is summarized in Table 99.

Debug option

In both switched mode and autoswitched mode, setting the bit DG in MPWME register

enables the debug option. This option consists of outputting the C, D and Z signals in real

time on pins MCZEM and MCDEM. This is very useful during the debug phase of the

application. Figure 95 shows the signals output on pins MCDEM and MCZEM with the

debug option.

Note:

When the delay coefficient equals 0/256 (C event immediately after Z event), a

glitch appears on MCZEM pin to be able to see the event even in this case.

This option is also available in speed measurement mode with different signal outputs (see

Figure 95):

●

MCDEM toggles when a capture event is generated.

●

MCZEM toggles every time a U event is generated.

These signals are only available if the TES[1:0] bits = 10, 01 or 11.

In sensor mode, the MCDEM output pin toggles at each C event. The MCZEM

pin outputs the Z event.

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