UPD784224 Datasheet, PDF (7/92 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784224, 784225, 784224Y, 784225Y
1. DIFFERENCES AMONG MODELS IN µPD784225, 784225Y SUBSERIES
The only difference among the µPD784224 and 784225 lies in the internal memory capacity.
The µPD784224Y and 784225Y are based on the µPD784224 and 784225 respectively, with the addition of an
I²C bus control function.
The µPD78F4225 and 78F4225Y are provided with a 128-Kbyte 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 µPD784225, 784225Y Subseries
Part Number
Item
µPD784224,
µPD784224Y
µPD784225,
µPD784225Y
Internal ROM
96 Kbytes
(mask ROM)
128 Kbytes
(mask ROM)
Internal RAM
3,584 bytes
4,352 bytes
Internal memory None
size switching
register (IMS)^Note
Supply voltage VDD = 1.8 to 5.5 V
Electrical
specifications
Refer to the data sheet for each device.
Recommended
soldering
conditions
TEST pin
Provided
VPP pin
None
µPD78F4225,
µPD78F4225Y
128 Kbytes
(Flash memory)
Provided
VDD = 1.9 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.
Data Sheet U12376EJ1V0DS00
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