Pd78P054, 78P058; Chapter 26 Pd78P054, 78P058; Differences Between Pd78P054, 78P058 And Mask Rom Versions - NEC PD78052 User Manual

The PD78054, 78054Y subseries include the PD78P054, 78P058, 78P058Y as PROM versions.
For purposes of simplification, in this chapter, the description of the PD78P058 applies to both the PD78P058
and 78P058Y. Similarly, the PD78052, 78053, 78054, 78055, 78056, and 78058 are treated as the representative
models of the mask ROM products.
The PD78P054, 78P058 replace the internal mask ROM of the PD78054, 78058 with one-time PROM or
EPROM. Table 26-1 lists the differences among the PD78P054, 78P058 and the mask ROM versions. Table 26-
2 lists the differences between the PD78P054 and the PD78P058.
Table 26-1. Differences between PD78P054, 78P058 and Mask ROM Versions
Item
Internal ROM structure
Internal ROM capacity
Internal high-speed RAM capacity
Internal expansion RAM capacity
Changing internal ROM and internal high- Enable
speed RAM capacities with memory size
switching register
Changing of internal expansion RAM
capacity by internal expansion RAM size
switching register
IC pin
V pin
PP
Mask option with on-chip pull-up resistor
for P60 to P63 pins
Electrical characteristics
CHAPTER 26

PD78P054, 78P058

PD78P054, 78P058
One-time PROM/EPROM
PD78P054: 32 Kbytes
PD78P058: 60 Kbytes
1024 bytes
PD78P054: None
PD78P058: 1024 bytes
Note 1
Enable with PD78P058 only
None
Available
None
Refer to the separate Data Sheet.
Mask ROM version
Mask ROM
PD78052: 16 Kbytes
PD78053: 24 Kbytes
PD78054: 32 Kbytes
PD78055: 40 Kbytes
PD78056: 48 Kbytes
PD78058: 60 Kbytes
PD78052: 512 bytes
PD78053: 1024 bytes
PD78054: 1024 bytes
PD78055: 1024 bytes
PD78056: 1024 bytes
PD78058: 1024 bytes
PD78052: None
PD78053: None
PD78054: None
PD78055: None
PD78056: None
PD78058: 1024 bytes
Disable
Note 2
Disable
Available
None
None
547