Z8FMC16100 datasheet(53/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

Stop Mode

Z8FMC16100 Series Flash MCU

Product Specification

Low-Power Modes

The Z8FMC16100 Series Flash MCU products contain power-saving features. The high-

est level of power reduction is provided by STOP mode. The next level of power reduction

is provided by the HALT mode.

Stop Mode

Execution of the eZ8 CPU’s STOP instruction places the Z8FMC16100 Series Flash MCU

into STOP mode. In STOP mode, the operating characteristics are:

• Primary crystal oscillator and IPO are stopped; XIN and XOUT pins are driven to V

SS.

• System clock is stopped

• eZ8 CPU is stopped

• Program counter (PC) stops incrementing

• If enabled for operation during STOP mode, the Watch-Dog Timer and its internal RC

oscillator continue to operate.

• If enabled for operation in STOP mode through the associated Option Bit, the Voltage

Brown-Out protection circuit continues to operate.

• Comparators and voltage reference operate unless disabled.

• All other on-chip peripherals are idle

To minimize current in STOP mode, all GPIO pins that are configured as digital inputs

must be driven to one of the supply rails (VCC or GND), the Voltage Brown-Out protection

and the Watch-Dog Timer must be disabled. The device can be brought out of STOP mode

using Stop-Mode Recovery. For more information refer to the Reset and Stop-Mode

Recovery chapter on page 23.

To prevent excess current consumption, STOP mode must not be used if the device is

driven with an external clock source.

Halt Mode

Execution of the eZ8 CPU’s HALT instruction places the device into HALT mode. In

HALT mode, the operating characteristics are:

• Primary crystal oscillator is enabled and continues to operate

Caution:

Z8FMC16100 Datasheet(PDF) 53 Page - Zilog, Inc.