UPD65 datasheet(10/64 Pages) NEC

10 / 64 page

µPD64A, 65

Data Sheet U14380EJ2V0DS00

2.4 Program Memory (ROM): 1002 steps

× 10 bits (

µPD64A)

2026 steps

× 10 bits (

µPD65)

The ROM consists of 10 bits per step, and is addressed by the program counter.

The program memory stores programs and table data, etc.

The 22 steps from 7EAH to 7FFH cannot be used in the test program area.

Figure 2-3.

Program Memory Map

Note The unmounted area and test program area are so designed that a program or data placed in either of

them by mistake is returned to the 000H address.

2.5 Data Memory (RAM): 32

× 4 Bits

The data memory, which is a static RAM consisting of 32

× 4 bits, is used to retain processed data. The data

memory is sometimes processed in 8-bit units. R0 can be used as the ROM data pointer.

RF is also used as the ASR.

When reset, R0 is cleared to “00H” and R1 to RF retain the previous data (undefined when turning on the power).

10 bits

Page 0

000H

3FFH

400H

7E9H

7EAH

7FFH

000H

3E9H

3EAH

7E9H

7EAH

7FFH

Unmounted areaNote

Test program areaNote

Page 0

Page 1

10 bits

(a)

PD64A

(b)

PD65

µµ

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