S912XEG128J2MAA Datasheet, PDF (1214/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
Table A-9. Characteristics of Expantion Bus Inputs Port C, D, PE5, PE6, and PE7
for Reduced Input Voltage Thresholds
Conditions are 4.5 V < V_DD35 < 5.5 V Temperature from –40°C to +150°C, unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1 D Input high voltage
2 D Input low voltage
3 T Input hysteresis
VIH
1.75
—
—
V
VIL
—
—
0.75
V
VHYS
—
100
—
mV
A.1.10 Supply Currents
This section describes the current consumption characteristics of the device family as well as the
conditions for the measurements.
A.1.10.1 Typical Run Current Measurement Conditions
Since the current consumption of the output drivers is load dependent, all measurements are without output
loads and with minimum I/O activity. The currents are measured in single chip mode, S12XCPU code is
executed from Flash and XGATE code is executed from RAM. V_DD35=5V, internal voltage regulator is
enabled and the bus frequency is 50MHz using a 4-MHz oscillator in loop controlled Pierce mode.
Furthermore in expanded modes the currents flowing in the system are highly dependent on the load at the
address, data, and control signals as well as on the duty cycle of those signals. No generally applicable
numbers can be given. A very good estimate is to take the single chip currents and add the currents due to
the external loads.
Since the DBG and BDM modules are typically not used in the end application, the supply current values
for these modules is not specified.
An overhead of current consumption exisits independent of the listed modules, due to voltage regulation
and clock logic that is not dedicated to a specific module. This is listed in the table row named “overhead”.
A.1.10.2 Maximum Run Current Measurement Conditions
Currents are measured in single chip mode, S12XCPU and XGATE code is executed from RAM with
V_DD35=5.5V, internal voltage regulator enabled and a 50MHz bus frequency from a 4-MHz input.
Characterized parameters are derived using a 4MHz loop controlled Pierce oscillator. Production test
parameters are tested with a 4MHz square wave oscillator.
A.1.10.3 Current Conditions
Unbonded ports must be correctly initialized to prevent current consumption due to floating inputs. Typical
Stop current is measured with V_DD35=5V, maximum Stop current is measured with V_DD35=5.5V. Pseudo
Stop currents are measured with the oscillator configured for 4MHz LCP mode.
Table A-10. shows the configuration of the peripherals for typical run current.
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MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor