µPD784927 and 784928 are members of the NEC 78K/IV series of microcontrollers equipped with a high-speed, high-performance 16-bit CPU for VCR software servo control. The µPD784927Y and 784928Y are based on the µPD784928 with the addition of an I2C bus interface compatible with multi-master. They contain many peripheral hardware units ideal for VCR control, such as a multi-function timer unit (super timer unit) for software servo control and VCR analog circuits. Flash memory models, the µPD78F4928 and µPD78F4928Y, are under development. The functions of the µPD784927 is described in detail in the following User’s Manual. Be sure to read this manual before designing your system. µPD784928, 784928Y Subseries User’s Manual - Hardware: U12648E 78K/IV Series User’s Manual - Instruction: U10905E
The NEC uPD784927, PD784928 and their Y‑variant microcontrollers belong to the 78K/IV series and provide a high‑speed 16‑bit CPU for VCR‑servo control. The datasheet details internal memory capacities, peripheral functions such as timers, analog circuits, serial interfaces and power‑supply requirements.
Key information includes package options (100‑pin LQFP and QFP), operating clock options, I²C bus support for the Y sub‑series, and extensive pin‑configuration tables. Regional contact information and export restrictions are also listed.
| Internal ROM capacity | 96 KB (PD784927) / 128 KB (PD784928) |
|---|---|
| Internal RAM capacity | 2 KB (PD784927) / 3.5 KB (PD784928) |
| Operating clock | 16 MHz (internal clock 8 MHz) |
| Minimum instruction execution time | 250 ns (with 8 MHz internal clock) |
| Supply voltage range | +2.7 V to +5.5 V |
The devices operate with a supply voltage from +2.7 V to +5.5 V.
The PD784928 provides 128 KB of internal ROM.
The minimum instruction execution time is 250 ns when the internal clock runs at 8 MHz.