UPD64A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD64A

4-BIT SINGLE-CHIP MICROCONTROLLERS FOR INFRARED REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

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.

(a) µPD64A

Figure 2-3. Program Memory Map

(b) µPD65

000H

10 bits

000H

10 bits

µPD64A, 65

Page 0

Page 0

3E9H

3EAH

3FFH

400H

Unmounted areaNote

7E9H

7EAH

7FFH

Test program areaNote

7E9H

7EAH

7FFH

Test program areaNote

Page 1

Note The unmounted area and test program area are designed so 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 hold 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.

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

10

Data Sheet U14380EJ3V0DS00

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