LFDAS12XSDT Freescale Semiconductor, LFDAS12XSDT Datasheet - Page 497

• Manufacturer Part Number: LFDAS12XSDT
• Description: HARDWARE MC9S12XS 52-PIN
• Manufacturer: Freescale Semiconductor

Specifications of LFDAS12XSDT

• Module/board Type: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: -

17.3.2.3
The VREGAPICL register allows the configuration of the VREG_3V3 autonomous periodical interrupt
features.
Freescale Semiconductor
0x02F2
APICLK
Reset
APIES
APIEA
APIFE
Field
APIE
APIF
7
4
3
2
1
0
W
R
APICLK
Autonomous Periodical Interrupt Clock Select Bit — Selects the clock source for the API. Writable only if
APIFE = 0; APICLK cannot be changed if APIFE is set by the same write operation.
0 Autonomous periodical interrupt clock used as source.
1 Bus clock used as source.
Autonomous Periodical Interrupt External Select Bit — Selects the waveform at the external pin.If set, at the
external pin a clock is visible with 2 times the selected API Period
be a high pulse at the end of every selected period with the size of half of the min period
device level specification for connectivity.
0 At the external periodic high pulses are visible, if APIEA and APIFE is set.
1 At the external pin a clock is visible, if APIEA and APIFE is set.
Autonomous Periodical Interrupt External Access Enable Bit — If set, the waveform selected by bit APIES
can be accessed externally. See device level specification for connectivity.
0 Waveform selected by APIES can not be accessed externally.
1 Waveform selected by APIES can be accessed externally, if APIFE is set.
Autonomous Periodical Interrupt Feature Enable Bit — Enables the API feature and starts the API timer
when set.
0 Autonomous periodical interrupt is disabled.
1 Autonomous periodical interrupt is enabled and timer starts running.
Autonomous Periodical Interrupt Enable Bit
0 API interrupt request is disabled.
1 API interrupt will be requested whenever APIF is set.
Autonomous Periodical Interrupt Flag — APIF is set to 1 when the in the API configured time has elapsed.
This flag can only be cleared by writing a 1 to it. Clearing of the flag has precedence over setting.
Writing a 0 has no effect. If enabled (APIE = 1), APIF causes an interrupt request.
0 API timeout has not yet occurred.
1 API timeout has occurred.
Autonomous Periodical Interrupt Control Register (VREGAPICL)
0
7
Figure 17-3. Autonomous Periodical Interrupt Control Register (VREGAPICL)
= Unimplemented or Reserved
0
0
6
Table 17-6. VREGAPICL Field Descriptions
S12XS Family Reference Manual, Rev. 1.11
0
0
5
APIES
0
4
Description
APIEA
0
3
(Table
17-10). If not set, at the external pin will
APIFE
0
2
Voltage Regulator (S12VREGL3V3V1)
APIE
0
1
(Table
17-10). See
APIF
0
0
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