UPD784218 Datasheet, PDF (8/92 Pages) NEC – 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784218, 784218Y
1. DIFFERENCES AMONG MODELS IN µPD784218, 784218Y SUBSERIES
The µPD784218Y is the µPD784218 with I²C bus control added.
The µPD78F4218 and 78F4218Y are provided with a 256 KB flash memory instead of the mask ROM of the above
models. These differences are summarized in Table 1-1.
Table 1-1. Differences Among Models in µPD784218, 784218Y Subseries
Part Number
Item
Internal ROM
Internal RAM
Internal memory
size switching
register (IMS)
Supply voltage
Electrical
specifications
Recommended
soldering
conditions
TEST pin
VPP pin
µPD784218, µPD784218Y
256 KB
(mask ROM)
12,800 bytes
None
VDD = 2.2 to 5.5 V
Refer to the data sheet for each device.
Provided
None
µPD78F4218, µPD78F4218Y
256 KB
(Flash memory)
Provided^Note
VDD = 2.7 to 5.5 V
None
Provided
Note The internal flash memory capacity and internal RAM capacity can be changed 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 on the commercial samples (not engineering samples) of the mask
ROM version.
2. DIFFERENCES BETWEEN µPD784218 AND µPD784216
Table 2-1 shows the differences between the µPD784218 and µPD784216.
Table 2-1. Differences between µPD784218 and µPD784216
Item
Part Number
Internal ROM
Internal RAM
ROM correction
External access status function
µPD784218
256 KB
12,800 bytes
Provided
Provided
µPD784216
128 KB
8,192 bytes
None
None
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Data Sheet U12304EJ2V0DS00