
Electrical Characteristics
S12XS Family Reference Manual, Rev. 1.10
Freescale Semiconductor
669
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 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. VDD35=5V, internal voltage regulator is enabled and the bus frequency is 40MHz
using a 4MHz oscillator in loop controlled Pierce mode.
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 exists independent of the listed modules, due to voltage regulation
and clock logic that is not dedicated to a specic module. This is listed in the table row named “overhead”.
Table A-9 shows the conguration of the peripherals for typical run current.
A.1.10.2
Maximum Run Current Measurement Conditions
Currents are measured in single chip mode, S12XCPU with VDD35=5.5V, internal voltage regulator
enabled and a 40MHz bus frequency from a 4MHz input. Characterized parameters are derived using a
16
D Port H, J, P interrupt input pulse passed (STOP)
tPULSE
4
—
tcyc
17
D IRQ pulse width, edge-sensitive mode (STOP)
PWIRQ
1
—
tcyc
18
D XIRQ pulse width with X-bit set (STOP)
PWXIRQ
4
—
tosc
1 Maximum leakage current occurs at maximum operating temperature.
3 Parameter only applies in stop or pseudo stop mode.
Table A-9. Module Congurations for Typical Run Supply (VDDR+VDDA) Current
VDD35=5V
Peripheral
Conguration
S12XCPU
420 cycle loop: 384 DBNE cycles plus subroutine entry to stimulate stacking (RAM access)
MSCAN
Congured to loop-back mode using a bit rate of 500kbit/s
SPI
Congured to master mode, continuously transmit data (0x55 or 0xAA) at 2Mbit/s
SCI
Congured into loop mode, continuously transmit data (0x55) at speed of 19200 baud
PWM
Congured to toggle its pins at the rate of 1kHz
TIM
The peripheral shall be congured in output compare mode. Pulse accumulator and modulus
counter enabled.
ATD
The peripheral is congured to operate at its maximum specied
frequency and to continuously convert voltages on all input channels in sequence.
Overhead
VREG supplying 1.8V from a 5V input voltage, PLL on
Table A-8. 5-V I/O Characteristics
Conditions are 4.5 V < VDD35 < 5.5 V junction temperature from –40°C to +150°C, unless otherwise noted
I/O Characteristics for all I/O pins except EXTAL, XTAL,TEST and supply pins.