UPD784915AGF View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD784915AGF

16-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784915A, 784916A

1. DIFFERENCES AMONG µPD784915 SUBSERIES PRODUCTS

The µPD784915 subseries comprises the four products shown in Table 1-1. The µPD784915A, which is a process-

shrinked version of the µPD784915 is a low-cost product. The µPD784916A is a version of the µPD784915 with

internal ROM extended to 62K bytes. The µPD78P4916 is a product with the mask ROM of the µPD784915, 784915A,

and 784916A replaced by a writable one-time PROM. Therefore, it has the same functions as those of the µPD784915,

784915A and 784916A, with only exception that it has PROM for internal ROM and a different capacity.

Before using the PROM to perform debugging or preproduction of an application system and then using the mask

ROM to proceed with volume production, etc., thoroughly check the differences between these products.

For more information about the CPU functions and on-chip hardware, see µPD784915 Subseries User’s Manual

- Hardware (U10444E).

Table 1-1. Differences among µPD784915 Subseries Products

Internal ROM

Item

Internal RAM

Internal memory capacity select register (IMS)

Pin connections

Other

µPD784915, 784915A µPD784916A

µPD78P4916

Mask ROM

Mask ROM

One-time PROM

48K bytes

62K bytes

62K bytesNote

1280 bytes

1280 bytes

2048 bytesNote

Not available

Not available

Available

The µPD78P4916 has additional PROM write/read related

pin functions.

Since these products are different in circuit scale and mask

layout, they partly differ in noise resistance, noise radiation

and electrical specifications.

Note The internal PROM and internal RAM capacities can be changed by the internal memory capacity select

register (IMS).

Caution

The PROM version and mask ROM version differ in noise immunity and noise radiation, etc.

When considering replacing a PROM product with a mask ROM product when switching from

preproduction to volume production, perform sufficient evaluation using a CS version (not ES

version) of the mask ROM product.

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