upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 28

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

2.4.4
hardware and for storage of data during table referencing.
28
(1) Functions of the data buffer
The data buffer on addresses 0CH to 0FH of the data memory is used for data transfer to and from peripheral
The data buffer has two major functions: a function to transfer data to and from hardware and a function to
read constant data from the program memory (for table referencing). Figure 2-9 shows the relationship
between the data buffer and peripheral hardware.
Data buffer (DBF)
Data buffer
(DBF)
Program memory
Internal bus
Constant data
Figure 2-9. Data Buffer and Peripheral Hardware
(ROM)
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
Data Sheet U15002EJ1V1DS
05H, 06H
03H, 04H
Peripheral
address
40H
(NRZLTMM, NRZHTMM)
Address register (AR)
Peripheral hardware
Carrier generator for
remote controller
(TMC, TMM)
8-bit timer