UPD64 datasheet(10/68 Pages) NEC

10 / 68 page

µPD63, 63A, 64

2.4 Program Memory (ROM): 512 steps

× 10 bits (

µPD63)

768 steps

× 10 bits (

µPD63A)

1002 steps

× 10 bits (

µPD64)

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 3EAH to 3FFH cannot be used in the test program area.

Figure 2-3.

Program Memory Map

(a)

µPD63

(b)

µPD63A

(c)

µPD64

000H

0FFH

100H

1FFH

000H

0FFH

100H

1FFH

200H

2FFH

300H

3EAH

3FFH

3E9H

10 bits

Unmounted areaNote

3EAH

3FFH

Test program areaNote

10 bits

200H

000H

0FFH

100H

1FFH

10 bits

Unmounted areaNote

3EAH

3FFH

Test program areaNote

200H

3E9H

2FFH

300H

3E9H

Test program areaNote

Note The unmounted area and the 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).

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