Freescale Semiconductor MPC5553, Reference Manual

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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 2-55
are named EMIOS[14:15], the balls for these signals are named GPIO[203:204]. The alternate function for
these pins is GPIO.
2.3.12.2 GPIO
GPIO[205:207]
The GPIO[205:207] pins only have GPIO functionality. These pins are reserved for double data rate
memory interface support. The pad type for GPIO[205] is medium driver and CMOS input buffer, 5 V
capability. The pad type for GPIO[206:207] is fast driver and CMOS input buffer (1.62–1.98 V). The
GPIO[206:207] pins can be selected as sources for the ADC trigger in the SIU_ETISR. Refer to
Section 6.3.1.12.98, “Pad Configuration Registers 206–207 (SIU_PCR206–SIU_PCR207) .”
2.3.13 Clock Synthesizer Signals
2.3.13.1 Crystal Oscillator Output
XTAL
XTAL is the output pin for an external crystal oscillator.
2.3.13.2 Crystal Oscillator Input / External Clock Input
EXTAL_EXTCLK
EXTAL is the input pin for an external crystal oscillator or an external clock source. The alternate function
is the external clock input. The function of this pin is determined by the PLLCFG configuration pins.
2.3.13.3 System Clock Output
CLKOUT
CLKOUT is an MPC5553/MPC5554 system clock output.
2.3.13.4 Engineering Clock Output
ENGCLK
ENGCLK is a 50% duty cycle output clock with a maximum frequency of the MPC5553/MPC5554
system clock divided by two. ENGCLK is not synchronous to CLKOUT.
2.3.14 Power/Ground Signals
2.3.14.1 Voltage Regulator Control Supply Input
V
RC33
V
RC33
is the 3.3 V supply input pin for the on-chip 1.5 V regulator control circuit.
2.3.14.2 Voltage Regulator Control Ground Input
V
RCVSS
V
RCVSS
is the ground reference for the on-chip 1.5 V regulator control circuit. This signal is not available
on the 208 package.