This is a technical manual for EM78815 8-BIT MICRO-CONTROLLER
The EM78815 is an 8‑bit CID RISC microcontroller from Elan Microelectronics, featuring low‑power CMOS technology, an on‑chip watchdog, real‑time clock, LCD controller, and various tone and decoder functions for CID calling message display.
The document lists the device's electrical characteristics, memory sizes, I/O capabilities, clock options, and pin assignments, along with functional block diagrams and example application circuits for LCD drivers.
| Operating voltage range | 2.2V~3.6V (Normal mode), 2.0V~3.6V (Green mode) |
|---|---|
| Program ROM | 64K x 13 on‑chip, up to 128K word program |
| Data ROM | 256K x 8 on‑chip, up to 2M byte data |
| Data RAM | 4K x 8 |
| I/O ports | Up to 56 bi‑directional tri‑state ports |
| Main clock | 3.5862 MHz × 0.5, 1, 1.5 or 3 (internal PLL) |
The device operates from 2.2 V to 3.6 V in normal mode and from 2.0 V to 3.6 V in green mode.
It includes a 64K × 13 on‑chip program ROM that can support up to 128K words of program code.
The microcontroller offers up to 56 bi‑directional tri‑state I/O ports.
It provides a 32.768 kHz sub‑clock and a main clock of 3.5862 MHz that can be multiplied by 0.5, 1, 1.5 or 3 via an internal PLL.