UPD17225 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD17225

4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

NEC => Renesas Technology 

µPD17225, 17226, 17227, 17228

2.4.4 Data buffer (DBF)

The data buffer on the addresses 0CH to 0FH of data memory is used for data transfer to and from peripheral hardware

and for storage of data during table reference.

(1) Functions of the data buffer

The data buffer has two major functions: a function to transfer to and from hardware and a function to read

constant data from the program memory (for table reference). Figure 2-7 shows the relationship between the

data buffer and peripheral hardware.

Figure 2-7. Data Buffer and Peripheral Hardware

Data buffer

(DBF)

Internal bus

Program memory

(ROM)

Constant data

Peripheral

address

05H, 06H

03H, 04H

Peripheral hardware

8-bit timer

(TMC, TMM)

Carrier generator for

remote controller

(NRZLTMM, NRZHTMM)

40H

Address register (AR)

Data Sheet U12643EJ2V0DS00

19

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