NEC uPD78053(A) Manuale Utente

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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-
Enable
Note 1
Disable
speed RAM capacities with memory size
switching register
Changing of internal expansion RAM
Enable with 
µ
PD78P058 only
Note 2
Disable
capacity by internal expansion RAM size
switching register
IC pin
None
Available
V
PP
 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.