mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 560

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 14 Voltage Regulator (S12VREG3V3V5)
14.3.2.3
The VREGAPICL register allows the configuration of the VREG_3V3 autonomous periodical interrupt
features.
560
APICLK
Reset
APIFE
Field
APIE
APIF
7
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 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 14-4. Autonomous Periodical Interrupt Control Register (VREGAPICL)
= Unimplemented or Reserved
0
0
6
Table 14-4. VREGAPICL Field Descriptions
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
0
0
4
Description
0
0
3
APIFE
0
2
Freescale Semiconductor
APIE
0
1
APIF
0
0