S912XHY128F0VLM Datasheet, PDF(312/802 Page) Freescale Semiconductor, Inc – S12 Microcontrollers

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S912XHY128F0VLM Datasheet, PDF (312/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

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Voltage Regulator (S12VREGL3V3V1)

It is possible to generate with the API a waveform at an external pin by enabling the API by setting APIFE

and enabling the external access with setting APIEA. By setting APIES the waveform can be selected. If

APIES is set, then at the external pin a clock is visible with 2 times the selected API Period (Table 9-10).

If APIES is not set, then at the external pin will be a high pulse at the end of every selected period with the

size of half of the min period (Table 9-10). See device level speciï¬cation for connectivity.

9.4.9 Resets

This section describes how VREG_3V3 controls the reset of the MCU.The reset values of registers and

signals are provided in Section 9.3, âMemory Map and Register Deï¬nitionâ. Possible reset sources are

listed in Table 9-13.

Table 9-13. Reset Sources

Reset Source

Power-on reset

Low-voltage reset

Local Enable

Always active

Available only in Full Performance Mode

9.4.10 Description of Reset Operation

9.4.10.1 Power-On Reset (POR)

During chip power-up the digital core may not work if its supply voltage VDD is below the POR

deassertion level (VPORD). Therefore, signal POR, which forces the other blocks of the device into reset,

is kept high until VDD exceeds VPORD. The MCU will run the start-up sequence after POR deassertion.

The power-on reset is active in all operation modes of VREG_3V3.

9.4.10.2 Low-Voltage Reset (LVR)

For details on low-voltage reset, see Section 9.4.5, âLow-Voltage Reset (LVR)â.

9.4.11 Interrupts

This section describes all interrupts originated by VREG_3V3.

The interrupt vectors requested by VREG_3V3 are listed in Table 9-14. Vector addresses and interrupt

priorities are deï¬ned at MCU level.

Table 9-14. Interrupt Vectors

Interrupt Source

Low-voltage interrupt (LVI)

High Temperature Interrupt (HTI)

Autonomous periodical interrupt (API)

Local Enable

LVIE = 1; available only in Full Performance

Mode

HTIE=1;

available only in Full Performance Mode

APIE = 1

MC9S12XHY-Family Reference Manual, Rev. 1.01

312

Freescale Semiconductor

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