UPD6125A 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD6125A

4-BIT SINGLE CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD6125A, 6126A

3. PROGRAM MEMORY (ROM) ……… 1002 STEPS × 10 BITS

The program memory (ROM) is configured in 10 bits steps. It is addressed by the program counter.

Program and table data are stored in the program memory.

Figure 3-1. Program Memory Map

000H

0FFH

100H

1FFH

200H

2FFH

300H

3E9H

3EAH

3FFH

4. DATA MEMORY (RAM) ……… 32 WORDS × 5 BITS

Test program

area

The data memory is a RAM of 32 words × 5 bits. The data memory stores processing data. In some cases, the

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

After power application, the RAM will be undefined. The RAM retains the previous data on reset.

Figure 4-1. Data Memory Organization

1

0

R0

to

RB

RC

SP-3

to

SP-2

SP-1

RF

SP-0

Caution

Avoid using the RAM areas RD, RE, and RF in a CALL routine as much as possible because these

areas are also used as stack memory areas (to prevent program hang-up in case the value of

the SP is destroyed due to some reason such as noise).

When using these RAM areas as general-purpose RAM areas, be sure to include stack pointer

checking in the main routine.

5

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