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TO DRIVE OR NOT TO DRIVE EXTERNAL PINS WHILE IN LOW POWER STOP MODE

IP.com Disclosure Number: IPCOM000007155D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Feb-28

Publishing Venue

Motorola

Related People

Authors:
Oded Yishay Joe Jelemensky Sangrock Jin

Abstract

The Motorola Modular Microcontroller Family MCUs support a Low Power STOP (LPSTOP) mode. In Low Power STOP mode the MCU goes to it's lowest power consumption state under the CPU con- trol. In this LPSTOP mode, the external bus is not used by the MCU since the CPU is not available to run external bus cycles. To reduce the MCU's cur- rent drain, internal and external clocks of the MCU are stopped when the MCU enters the LPSTOP mode.