UPD784938 Datasheet, PDF (671/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 28 µPD78F4938 PROGRAMMING
The µPD78F4938 is a flash memory version of the µPD784938 Subseries.
The µPD78F4938 has on-chip flash memory that allows write, erase, and rewrite of programs in the state in which it
is mounted on the substrate. Table 28-1 shows the differences between the flash memory version (µPD78F4938) and the
mask ROM versions (µPD784935, 784936, 784937, and 784938).
Table 28-1. Differences between the µPD78F4938 Mask ROM Versions
Item
Internal ROM type
Internal ROM capacity
µPD78F4938
Flash memory
256 Kbytes
Internal RAM capacity
10,240 bytes
Internal memory size switching register (IMS)
IC pin
VPP pin
Available
Not available
Available
Mask ROM Versions
Mask ROM
µPD784935: 96 Kbytes
µPD784936: 128 Kbytes
µPD784937: 192 Kbytes
µPD784938: 256 Kbytes
µPD784935: 5,120 bytes
µPD784936: 6,656 bytes
µPD784937: 8,192 bytes
µPD784938: 10,240 bytes
Not available
Available
Not available
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.
Preliminary User’s Manual U13987EJ1V0UM00
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