LA76931S is the latest dual-function (CPU + decoder) color TV dedicated super chip developed by Sanyo Company of Japan. Our company has developed corresponding control software and masked the dual-function super chip, which can be applied to 14”～29” machine cores, and has multiple function extensions. On a single PCB mainboard, it can realize the full series of machines from simple to high-end.
This manual describes the LA76931S CPU developed by Sanyo for 14‑29" TV sets. It outlines the hardware features such as RAM, ROM, display capabilities, instruction cycle, and built‑in control ports, as well as the software functions that can be enabled through EEPROM settings.
Detailed sections cover pin‑out diagrams, CPU and LCB637X port definitions, factory flag settings, TV‑HDVD dual‑mode operation, over‑modulation control, and automatic debugging procedures. The document also includes key‑press definitions and step‑by‑step instructions for entering factory menus and adjusting system parameters. This manual is written in Chinese.
| RAM | 512×8 bits |
|---|---|
| ROM | 32K or 48K selectable |
| Screen display | 16 rows × 36 columns |
| Character matrix | 248 characters of 18×32 dots |
| Character colors | 64 colors |
| Instruction cycle | 0.85 ns (minimum) |
| TO ports | 10 configurable I/O ports |
| AD converters | 5 × 8‑bit |
| PVW output ports | 3 × 7‑bit |
| Control ports | 3 groups of 11C ports |
| Timers/Counters | 16‑bit timer/counter |
| Interrupt sources | 15 sources, 9 entries |
| Clock | 32.768 kHz crystal |
| Power input | 5 V |
| Package | 64‑pin S‑DP |
Press and hold the PP key for 4 seconds, or hold the remote VOL‑ key until volume reaches zero and then press the remote PC8 key.
Enable the "no program stored auto‑search" function, which activates automatic channel search on power‑up if no stored programs are found.
The minimum instruction cycle of the CPU is 0.85 ns.
The CPU provides 10 configurable TO ports for input and output.