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UPD784938 Datasheet(PDF) 39 Page - NEC |
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UPD784938 Datasheet(HTML) 39 Page - NEC |
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39 / 733 page  39 Preliminary User’s Manual U13987EJ1V0UM00 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 IEBusTM (Inter Equipment BusTM) 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. These models can be used in the following fields: • Car audio, etc. PD784936 PD78F4938 Flash memory RAM 256 Kbytes 10,240 bytes Flash memory models PD784938 ROM RAM 256 Kbytes 10,240 bytes Mask ROM models PD784937 ROM RAM 192 Kbytes 8,192 bytes ROM RAM 128 Kbytes 6,656 bytes PD784935 ROM RAM 96 Kbytes 5,120 bytes µ µ µ µ µ |
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