This document is an introduction to the Module No. 5109 MA0901-ChA product. The product is a microcontroller based on the ARM Cortex-M3 core, and has a variety of features, such as a programmable clock generator, on-chip debugger, etc.
This manual explains how to set the time, use the stopwatch function, and adjust the hands on the Casio 5109 watch. It includes details on the display layout, accuracy specifications, and operating procedures.
The guide also covers maintenance topics such as battery replacement, waterproof handling, storage recommendations, and precautions against shock and static electricity. This manual is written in Chinese.
| Accuracy (room temperature) | ±20 seconds per month |
|---|---|
| Display | 3 hands (hour, minute, second) with three sub‑dials |
| Battery type | SR621SW button cell |
| Stopwatch measurement limit | 2959 seconds, 1‑second resolution |
Pull the crown outward to stop the seconds hand.
Replace the battery approximately every 1 to 3 years.
Rinse the watch with fresh water and dry it thoroughly before further use.