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UPD784908 Datasheet(PDF) 6 Page - NEC |
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UPD784908 Datasheet(HTML) 6 Page - NEC |
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6 / 52 page  µPD78F4938A 6 Data Sheet U14118EJ1V0DS 1. DIFFERENCES AMONG PRODUCTS IN µPD784938A SUBSERIES The only difference between the µPD784935A, 784936A, 784937A, and 784938A is the internal memory capacity. The µPD78F4938A has a 256 KB flash memory in the place of the mask ROM of the above products. Table 1- 1 shows the differences between these products. Table 1-1. Differences Among Products in µPD784938A Subseries Part Number µPD784935A µPD784936A µPD784937A µPD784938A µPD78F4938A Item Internal ROM 96 KB 128 KB 192 KB 256 KB Mask ROM Flash memory Internal RAM 5120 bytes 6656 bytes 8192 bytes 10496 bytes Regulator Provided None Electrical specifications Refer to the data sheet of each product. Internal memory size None Provided switching registerNote IC pin Provided None VPP pin None Provided Note The internal flash memory capacity and internal RAM capacity can be changed by using the internal memory size switching register (IMS). Caution There are differences in noise immunity and noise radiation between the flash memory and mask ROM versions. When pre-producing an application set with the flash memory version and then mass-producing it with the mask ROM version, be sure to conduct sufficient evaluations for the commercial samples (not engineering samples) of the mask ROM version. |
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