Chapter 19 Μ Pd78P0208 - NEC mPD780208 Subseries User Manual

The µ PD78P0208 is a product integrating a one-time programmable ROM (one-time PROM). Table 19-
1 shows the differences between the µ PD78P0208 and the mask ROM versions ( µ PD780204, 780204A,
780205, 780205A, 780206, and 780208).
Table 19-1. Differences Between µ PD78P0208 and Mask ROM Versions
Item
Internal ROM configuration
Internal ROM capacity
Internal expansion RAM capacity
Change in capacity of internal
ROM by means of internal memory
size switching register (IMS)
Internal expansion RAM size
switching register (IXS)
IC pin
V pin
PP
P30/TO0 to P32/TO2, P33/TI1,
P34/TI2, P35/PCL, P36/BUZ, P37
P70 to P74
FIP0 to FIP12
P80/FIP13 to P87/FIP20,
P90/FIP21 to P97/FIP28,
P100/FIP29 to P107/FIP36,
P110/FIP37 to P117/FIP44,
P120/FIP45 to P127/FIP52
Electrical specifications
Notes 1. After RESET input, the internal PROM capacity is set to 60 KB.
2. After RESET input, the internal expansion RAM capacity is set to 1024 bytes.
Caution There are differences in noise immunity and noise radiation between the PROM and mask ROM
versions. When pre-producing an application set with the PROM 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.
CHAPTER 19 µ PD78P0208
µ PD78P0208
One-time PROM
60 KB
1024 bytes
Possible Note 1
Provided (Internal expansion RAM
capacity can be changed using
Note 2
IXS .)
None
Provided
On-chip pull-down resistors are not
provided.
On-chip pull-up resistors are not
provided.
On-chip pull-down resistors are
provided (connected to V
LOAD
On-chip pull-down resistors are not
provided.
Refer to the separate data sheet.
User's Manual U11302EJ4V0UM
Mask ROM Versions
Mask ROM
µ PD780204:
µ PD780204A: 32 KB
µ PD780205:
µ PD780205A: 40 KB
µ PD780206:
µ PD780208:
µ PD780204:
µ PD780204A: None
µ PD780205:
µ PD780205A: None
µ PD780206:
µ PD780208:
Impossible
µ PD780204, 780204A,
µ PD780205, 780205A: Not provided
µ PD780206, 780208:
(However, internal expansion RAM
capacity cannot be changed.)
Provided
None
On-chip pull-down resistors can be
specified in 1-bit units by mask option.
On-chip pull-up resistors can be
specified in 1-bit units by mask option.
On-chip pull-down resistors can be
). specified in 1-bit units by mask option.
On-chip pull-down resistors can be
specified in 1-bit units by mask option.
Pull-down resistors can be specified to
be connected to either V
bit units from P80.
32 KB
40 KB
48 KB
60 KB
None
None
1024 bytes
1024 bytes
Provided
or V in 4-
LOAD SS
371