Name: MVME147-022 Motorola PLC Control Board
Price: 3433 CNY
Availability: InStock

Description

The MVME147-22 module is shipped with the M48T18 RTC chip’s oscillator stopped, to minimize current drain from the onchip battery. A normal cold start of the MVME147, when the 147Bug EPROMs are installed, starts the oscillation; but before you can use your MVME147-22, you will need to set the time and date correctly with the 147Bug’s SET command. The MVME147-22’s NVRAM contains certain operating environment parameters. Before you begin using your MVME147, you should verify these default parameters and/or change them with 147Bug’s ENV command.
The function codes identify the address space being accessed on any given bus cycle, and in general, they are an extension of the address. This becomes more obvious when using a memory management unit, because two identical logical addresses can be made to map to two different physical addresses. In this case, the function codes provide the additional information required to find the proper memory location.
Description Begin the SET command’s interactive dialog by entering SET followed by a carriage return (CR). SET displays date, time, and calibration values, and prompts for entry of the date in the form MM/DD/YY. To change the displayed date, type a new date followed by (CR); to accept the displayed date unchanged, simply enter (CR). Note To correct an incorrect entry, backspace or delete the entire line before pressing the carriage return. When the carriage return is entered, the values are stored in the time-of-day clock.
The next prompt asks for a calibration value. This value slows down (- value) or speeds up (+ value) the RTC in the M48T18 chip. Refer to the M48T18 data sheet (listed in Related Documentation in Chapter 1) for details. The third prompt asks for the time in the form HH:MM:SS. To change the displayed time, type a new time followed by (CR); to accept the displayed time unchanged, simply enter (CR).

MVME147-022 PDF

MVME147-22 MVME147-22

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