Signal Description
MPC5566 Microcontroller Reference Manual, Rev. 2
2-42 Freescale Semiconductor
2.3.12.8 Calibration Transfer Start
CAL_TS
CAL_TS is the primary function and is a calibration transfer start. It is functional only when using the 496
pin assembly.
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 the device 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 device system clock divided
by two. ENGCLK is not synchronous to CLKOUT.
2.3.14 Power and 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.
2.3.14.3 Voltage Regulator Control Output
V
RCCTL
V
RCCTL
is the output pin for the on-chip 1.5 V regulator control circuit.
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