78K/IV series µPD784907 and µPD784908 single-chip microcontrollers are products of the µPD784908 subseries. They integrate IEBusTM controller, ROM, RAM, I/O ports, 8-bit resolution A/D, timers, serial interface, and interrupt functions, as well as a high-speed, high-performance CPU. In addition, the µPD78P4908 (one-time PROM product), which is used to evaluate the functions of mask ROM versions, and development tools are also available. Detailed function descriptions are provided in the following user's manuals. Be sure to read them before designing.
This document is a data sheet for the NEC uPD784907 and uPD784908, which are products of the 78K/IV Series. These 16-bit single-chip microcontrollers contain various peripheral hardware, including an IEBus controller, ROM, RAM, I/O ports, an 8-bit resolution A/D converter, timers, serial interfaces, and interrupt functions, along with a high-speed, high-performance CPU.
The document details the differences between the uPD784907 and uPD784908 models, noting that the primary distinction is their internal memory capacities (96 K vs 128 K bytes of ROM and 3,584 vs 4,352 bytes of RAM). It also specifies that the uPD78P4908 is a one-time PROM variant used for evaluating mask ROM versions.
| Internal ROM | 96 K (uPD784907) / 128 K (uPD784908) |
|---|---|
| Internal RAM | 3,584 bytes (uPD784907) / 4,352 bytes (uPD784908) |
| Number of I/O ports | 80 |
| A/D converter resolution | 8-bit |
| Timer/counter units | 3 units |
| Serial interface channels | 4 channels |
| Supply voltage | 4.0 to 5.5 V |
| Package | 100-pin plastic QFP (14 x 20 mm) |
The minimum instruction execution time is 320 ns at 6.29 MHz.
No, the uPD784908 does not include a regulator, unlike the uPD784907.