NEC CHAPTER 26 , PD78P054, 78P058

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CHAPTER 26 µ PD78P054, 78P058
The µ PD78054, 78054Y subseries include the µ PD78P054, 78P058, 78P058Y as PROM versions.
For purposes of simplification, in this chapter, the description of the
µ PD78P058 applies to both the µ PD78P058
and 78P058Y. Similarly, the µ PD78052, 78053, 78054, 78055, 78056, and 78058 are treated as the representative
models of the mask ROM products.
The
µ PD78P054, 78P058 replace the internal mask ROM of the µ PD78054, 78058 with one-time PROM or
EPROM. Table 26-1 lists the differences among the µ PD78P054, 78P058 and the mask ROM versions. Table 26-
2 lists the differences between the µ PD78P054 and the µ PD78P058.
Table 26-1. Differences between
µ PD78P054, 78P058 and Mask ROM Versions
Item µ PD78P054, 78P058 Mask ROM version
Internal ROM structure One-time PROM/EPROM Mask ROM
Internal ROM capacity µ PD78P054: 32 Kbytes µ PD78052: 16 Kbytes
µ PD78P058: 60 Kbytes µ PD78053: 24 Kbytes
µ PD78054: 32 Kbytes
µ PD78055: 40 Kbytes
µ PD78056: 48 Kbytes
µ PD78058: 60 Kbytes
Internal high-speed RAM capacity 1024 bytes µ PD78052: 512 bytes
µ PD78053: 1024 bytes
µ PD78054: 1024 bytes
µ PD78055: 1024 bytes
µ PD78056: 1024 bytes
µ PD78058: 1024 bytes
Internal expansion RAM capacity µ PD78P054: None µ PD78052: None
µ PD78P058: 1024 bytes µ PD78053: None
µ PD78054: None
µ PD78055: None
µ PD78056: None
µ PD78058: 1024 bytes
Changing internal ROM and internal high- EnableNote 1 Disable
speed RAM capacities with memory size
switching register
Changing of internal expansion RAM Enable with µ PD78P058 onlyNote 2 Disable
capacity by internal expansion RAM size
switching register
IC pin None Available
VPP pin Available None
Mask option with on-chip pull-up resistor None None
for P60 to P63 pins
Electrical characteristics Refer to the separate Data Sheet.