Chapter 15 Pd78P083; Differences Between The Pd78P083 And Mask Rom Versions - NEC PD78081(A) User Manual

The PD78P083 is a single-chip microcontroller with an on-chip one-time PROM or with an on-chip EPROM which
has program write, erasure and rewrite capability.
Differences between the PD78P083 and mask ROM versions are shown in Table 15-1.
Table 15-1. Differences between the PD78P083 and Mask ROM Versions
Parameter
Internal ROM type
Internal ROM capacity
Internal high-speed RAM capacity
Internal ROM and internal high-speed
RAM capacity change by internal
memory size switching register (IMS)
IC pin
V pin
PP
Electrical specifications
Note The internal PROM becomes 24 Kbytes and the internal expansion RAM becomes 512 bytes by the RESET
input.
Caution Noise resistance and noise radiation differs between PROM versions and Mask ROM versions.
If studying the replacement of PROM versions with mask ROM versions in the process of
prototype to volume production, do a thorough evaluation with mask ROM versions with CS
versions (not ES versions).
CHAPTER 15 PD78P083
CHAPTER 15 PD78P083
PD78P083
One-time PROM/EPROM
24 Kbytes
512 bytes
Note
Enable
Not available
Available
Refer to a data sheet of each product
Mask ROM Versions
Mask ROM
PD78081 : 8 Kbytes
PD78082 : 16 Kbytes
PD78081 : 256 bytes
PD78082 : 384 bytes
Disable
Available
Not available
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