UPD17072 View Datasheet(PDF) - NEC => Renesas Technology

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UPD17072

4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM

NEC => Renesas Technology 

µPD17072,17073

4.4 Notes on Using Data Memory

4.4.1 On power-ON reset

On power-ON reset, the contents of the general-purpose data memory are “undefined”.

Initialize the memory if necessary.

4.4.2 Notes on data memory not provided

If a data memory manipulation instruction is executed to manipulate an address where no data memory is assigned,

the following operations are performed:

(1) Device operation

When a read instruction is executed, “0” is read.

Nothing is changed even when a write instruction is executed.

Address 40H of BANK1, bit 3 of address 50H, and address 73H are test mode areas. Do not write “1” to these

areas.

(2) Assembler operation

The program is assembled normally. No “error” occurs.

(3) In-circuit emulator operation

“0” is read when a read instruction is executed.

Nothing is changed when a write instruction is executed.

No “error” occurs.

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