NEC NEC PD78081(A), User Manual

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CHAPTER 15
µ
PD78P083
CHAPTER 15
µ
PD78P083
The
µ
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
µ
PD78P083 and mask ROM versions are shown in Table 15-1.
Table 15-1. Differences between the
µ
PD78P083 and Mask ROM Versions
Parameter
µ
PD78P083 Mask ROM Versions
Internal ROM type One-time PROM/EPROM Mask ROM
Internal ROM capacity 24 Kbytes
µ
PD78081 : 8 Kbytes
µ
PD78082 : 16 Kbytes
Internal high-speed RAM capacity 512 bytes
µ
PD78081 : 256 bytes
µ
PD78082 : 384 bytes
Internal ROM and internal high-speed Enable
Note
Disable
RAM capacity change by internal
memory size switching register (IMS)
IC pin Not available Available
V
PP
pin Available Not available
Electrical specifications Refer to a data sheet of each product
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).