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S912XEG384J3VA Datasheet, PDF (87/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family | |||
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Chapter 1 Device Overview MC9S12XE-Family
1.9 MPU Conï¬guration
The MPU has the option of a third bus master (CPU + XGATE + other) which is not present on this device
family but may be on other parts.
1.10 VREG Conï¬guration
The VREGEN connection of the voltage regulator is tied internally to VDDR such that the voltage
regulator is always enabled with VDDR connected to a positive supply voltage. The device must be
conï¬gured with the internal voltage regulator enabled. Operation in conjunction with an external voltage
regulator is not supported.
The autonomous periodic interrupt clock output is mapped to PortT[5].
The API trimming register APITR is loaded on rising edge of RESET from the Flash IFR option ï¬eld at
global address 0x40_00F0 bits[5:0] during the reset sequence. Currently factory programming of this IFR
range is not supported.
1.10.1 Temperature Sensor Conï¬guration
The VREG high temperature trimming register bits VREGHTTR[3:0] are loaded from the internal Flash
during the reset sequence. To use the high temperature interrupt within the speciï¬ed limits (THTIA and
THTID) these bits must be loaded with 0x8. Currently factory programming is not supported.
The device temperature can be monitored on ADC0 channel[17].
The internal bandgap reference voltage can also be mapped to ADC0 analog input channel[17]. The
voltage regulator VSEL bit when set, maps the bandgap and, when clear, maps the temperature sensor to
ADC0 channel[17].
Read access to reserved VREG register space returns â0â. Write accesses have no effect. This device does
not support access abort of reserved VREG register space.
1.11 BDM Clock Conï¬guration
The BDM alternate clock source is the oscillator clock.
1.12 S12XEPIM Conï¬guration
On smaller derivatives the S12XEPIM module is a subset of the S12XEP100. The registers of the
unavailable ports are unimplemented.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
87
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