UPD78P324 Datasheet, PDF (16/80 Pages) NEC – 16-/8-Bit Single-Chip Microcomputers

µPD78P324, 78P324(A)
2. DIFFERENCES BETWEEN µPD78P324 AND µPD78324
The µPD78P324 is a product in which the µPD78324’s internal mask ROM is replaced by a 32KB PROM.
Therefore, these two products share the same functions, except for differences deriving from the ROM
specifications (for example, Write and Verify, etc.). Their differences are shown in Table 2-1 below.
Table 2-1. Differences between µPD78P324 and µPD78324
Parameter
Product Name
µPD78P324
µPD78324
Internal program memory
(Electric write)
One-time PROM
(Write enabled only once)
EPROM
(Rewrite enabled)
Mask ROM
ECC circuit
With
Without
PROM programming pin
With
Without
Package
• 68-pin plastic QFJ
• 74-pin plastic QFP
• 68-pin ceramic WQFN
• 74-pin ceramic WQFN
• 68-pin plastic QFJ
• 74-pin plastic QFP
Electrical characteristics
Differ in current consumption, etc.
Others
As they differ in their circuit size and mask layout, their noise resistance volume and
noise reflection differ.
Cautions
1. The PROM product and the mask ROM product differ in their noise resistance volume and noise
reflection. If replacement of the PROM product with the mask ROM product in the process of trial
to mass production is being considered, ensure to make a sufficient evaluation with the CS
product (not ES product) of the mask ROM product.
2. The µPD78P324(A)/(A1)/(A2) are one-time PROM products only. The differences between the
µPD78P324(A)/(A1)/(A2) and the µPD78324(A)/(A1)/(A2) are the same as those shown in the table
above, except in terms of the EPROM product.
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