UPD784907 Datasheet, PDF (8/98 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784907, 784908
1. DIFFERENCES BETWEEN µPD784908 SUBSERIES PRODUCTS
The only difference between the µPD784907 and µPD784908 is their internal memory capacities.
The µPD78P4908 is produced by replacing the mask ROM in the µPD784907 or µPD784908 with 128-Kbyte one-
time PROM. Table 1-1 shows the differences between these products.
Table 1-1. Differences between the µPD784908 Subseries Products
Item
Part Number
µPD784907
µPD784908
Internal ROM
96 K (mask ROM)
128 K (mask ROM)
Internal RAM
3,584 bytes
4,352 bytes
Regulator
Provided
Power supply voltage
VDD = 4.0 to 5.5 V
(Main clock: fXX = 12.58 MHz, internal system clock = fXX,
fCYK = 79 ns)
VDD = 3.5 to 5.5 V
(other than above, fCYK = 159 ns)
Electrical specifications
Refer to the data sheet of each product.
µPD78P4908
128 K (one-time PROM)
None
VDD = 4.5 to 5.5 V
(Main clock: fXX = 12.58 MHz,
internal system clock = fXX,
fCYK = 79 ns)
VDD = 4.0 to 5.5 V
(other than above,
fCYK = 159 ns)
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Data Sheet U11680EJ2V0DS00