UPD6604GS datasheet(10/64 Pages) NEC

Part #	UPD6604GS

Description	4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

PDF	64 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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10 / 64 page

µPD6604

Data Sheet U11281EJ3V0DS00

2.4 Program Memory (ROM): 1002 Steps

× 10 Bits

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

000H

0FFH

100H

1FFH

200H

2FFH

300H

3EAH

3FFH

Test

program areaNote

3E9H

10 bits

Note The test program area is 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).

UPD6604GS Datasheet(PDF) 10 Page - NEC