S9S12XS256J0CAL Datasheet, PDF (504/738 Pages) Freescale Semiconductor, Inc – Microcontrollers

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 17-10).
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 17-10). See device level specification for connectivity.
17.4.9 Resets
This section describes how VREG_3V3 controls the reset of the MCU.The reset values of registers and
signals are provided in Section 17.3, “Memory Map and Register Definition”. Possible reset sources are
listed in Table 17-13.
Table 17-13. Reset Sources
Reset Source
Power-on reset
Low-voltage reset
Local Enable
Always active
Available only in Full Performance Mode
17.4.10 Description of Reset Operation
17.4.10.1 Power-On Reset (POR)
During chip power-up the digital core may not work if its supply voltage V_DD is below the POR
deassertion level (V_PORD). Therefore, signal POR, which forces the other blocks of the device into reset,
is kept high until V_DD exceeds V_PORD. The MCU will run the start-up sequence after POR deassertion.
The power-on reset is active in all operation modes of VREG_3V3.
17.4.10.2 Low-Voltage Reset (LVR)
For details on low-voltage reset, see Section 17.4.5, “Low-Voltage Reset (LVR)”.
17.4.11 Interrupts
This section describes all interrupts originated by VREG_3V3.
The interrupt vectors requested by VREG_3V3 are listed in Table 17-14. Vector addresses and interrupt
priorities are defined at MCU level.
Table 17-14. 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
S12XS Family Reference Manual, Rev. 1.13
504
Freescale Semiconductor