IBM nec pd78p081(a2) User Manual

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The 

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PD78P083 is a single-chip microcontroller with an on-chip one-time PROM or with an on-chip EPROM which

has program write, erasure and rewrite capability.

Differences between the 

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PD78P083 and mask ROM versions are shown in Table 15-1.

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Parameter

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PD78P083

Mask ROM Versions

Internal ROM type

One-time PROM/EPROM

Mask ROM

Internal ROM capacity

24 Kbytes

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PD78081  :  8 Kbytes

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PD78082  :  16 Kbytes

Internal high-speed RAM capacity

512 bytes

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PD78081  :  256 bytes

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PD78082  :  384 bytes

Internal ROM and internal high-speed

Enable 

Disable

RAM capacity change by internal

memory size switching register (IMS)

IC pin

Not available

Available

V

PP

 pin

Available

Not available

Electrical specifications

Refer to a data sheet of each product

The internal PROM becomes 24 Kbytes and the internal expansion RAM becomes 512 bytes by the RESET

input.