SPMCK16Z4MPV20 datasheet(302/500 Pages) FREESCALE

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ELECTRICAL CHARACTERISTICS

M68HC16 Z SERIES

A-18

USER’S MANUAL

13. The base configuration of the MC68HC16Z1, MC68CK16Z1, MC68HC16Z4, and the MC68CK16Z4 requires

a 32.768 kHz crystal reference. The base configuration of the MC68CM16Z1, MC68HC16Z2, and the

MC68HC16Z3 requires a 4.194 MHz crystal reference.

14. The RAM module will not switch into standby mode as long as VSB does not exceed VDD by more than 0.5

volts. The RAM array cannot be accessed while the module is in standby mode.

15. When VSB is more than 0.3 V greater than VDD, current flows between the VSTBY and VDD pins, which

causes standby current to increase toward the maximum transient condition specification. System noise on

the VDD and VSTBY pin can contribute to this condition.

16. Power dissipation is measured with the appropriate system clock frequency, all modules active. Power dissipation

can be calculated using the following expression:

PD = Maximum VDD (IDD + IDDSYN + ISB) + Maximum VDDA (IDDA)

IDD includes supply currents for all device modules powered by VDD pins.

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SPMCK16Z4MPV20 Datasheet(PDF) 302 Page - Freescale Semiconductor, Inc