UPD784938 Datasheet, PDF (39/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 1 GENERAL
The µPD784938 Subseries consists of 78K/IV Series products that combine a 78K/IV Series CPU core enabling mounting
large-capacity memory and a IEBus^TM (Inter Equipment Bus^TM) controller. The 78K/IV Series consists of 16-bit single-chip
microcontrollers, and comes with a high-performance CPU that has various functions including a function to access 1-Mbyte
memory spaces.
The µPD784938 Subseries is based on the µPD784908 Subseries. It features expanded internal ROM and RAM capacities
and the addition of a ROM correction function.
The µPD784938 has a 256-Kbyte mask ROM and 10,240-byte RAM on chip. Besides an IEBus controller, it features among
other things a high-performance timer counter, an 8-bit A/D converter, a PWM output function, a 2-channel independent serial
interface, and a watch timer.
The µPD784937 replaces the mask ROM of the µPD784938 with a 192-Kbyte mask ROM.
The µPD784936 replaces the mask ROM and RAM of the µPD784938 with a 128-Kbyte mask ROM and a 6,656-byte RAM.
The µPD784935 replaces the mask ROM and RAM of the µPD784938 with a 96-Kbyte mask ROM and a 5,120-byte RAM.
The µPD78F4938 replaces the mask ROM of the µPD784938 with flash memory.
The µPD784938 Subseries product lineup is as follows.
Flash memory models
Mask ROM models
µPD78F4938
Flash memory 256 Kbytes
RAM
10,240 bytes
µPD784938
ROM 256 Kbytes
RAM 10,240 bytes
µPD784937
ROM 192 Kbytes
RAM 8,192 bytes
µPD784936
ROM 128 Kbytes
RAM 6,656 bytes
These models can be used in the following fields:
• Car audio, etc.
µPD784935
ROM 96 Kbytes
RAM 5,120 bytes
Preliminary User’s Manual U13987EJ1V0UM00
39