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Appendix A Electrical Characteristics
MC9S12XF - Family Reference Manual, Rev.1.19
Freescale Semiconductor
1191
A.1.10
Supply Currents
This section describes the current consumption characteristics of the device as well as the conditions for
the measurements.
A.1.10.1
Typical 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. Unless otherwise noted the currents are measured in single chip
mode, S12X CPU code is executed from Flash and XGATE code is executed from RAM. VDD35=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 owing 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 specied.
An overhead of current consumption exisits independent of the listed modules, due to voltage regulation
and clock logic that is not dedicated to a specic module. This is listed in a separate table row named
“overhead”.
A.1.10.2
Maximum Current Measurement Conditions
Currents are measured in single chip mode, S12XCPU and XGATE code is executed from RAM with
VDD35=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.
Table A-8. Characteristics of Expantion Bus Inputs Port C, D, PE5, PE6, and PE7
for Reduced Input Voltage Thresholds
Conditions are 4.5 V < VDD35 < 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
VIH
1.75
—
V
2
D Input low voltage
VIL
—
0.75
V
3
T Input hysteresis
VHYS
—
100
—
mV