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Signal Descriptions
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 2-13
2.16 EzPort Signal Descriptions
Table 2-15 contains a list of EzPort external signals
2.17 Power and Ground Pins
The pins described in Table 2-16 provide system power and ground to the chip. Multiple pins are provided
for adequate current capability. All power supply pins must have adequate decoupling (bypass
capacitance) for high-frequency noise suppression.
Table 2-15. EzPort Signal Descriptions
Signal Name Abbreviation Function I/O
EzPort Clock EZPCK Shift clock for EzPort transfers I
EzPort Chip Select EZPCS Chip select for signaling the start and end of
serial transfers
I
EzPort Serial Data In EZPD EZPD is sampled on the rising edge of EZPCK I
EzPort Serial Data Out EZPQ EZPQ transitions on the falling edge of EZPCK O
Table 2-16. Power and Ground Pins
Signal Name Abbreviation Function I/O
PLL Analog Supply VDDPLL,
VSSPLL
Dedicated power supply signals to isolate the sensitive PLL analog
circuitry from the normal levels of noise present on the digital power
supply.
I
Positive Supply VDD These pins supply positive power to the core logic. I
Ground VSS This pin is the negative supply (ground) to the chip.