upd17225 Renesas Electronics Corporation., upd17225 Datasheet - Page 19

• Manufacturer Part Number: upd17225
• Description: 4-bit Single-chip Microcontroller For Small General-purpose Infrared Remote Control Transmitter
• Manufacturer: Renesas Electronics Corporation.

2.4.4
and for storage of data during table reference.
(1) Functions of the data buffer
The data buffer on the addresses 0CH to 0FH of data memory is used for data transfer to and from peripheral hardware
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.
Data buffer (DBF)
Data buffer
(DBF)
Program memory
Internal bus
Constant data
Figure 2-7. Data Buffer and Peripheral Hardware
(ROM)
Data Sheet U12643EJ2V0DS00
05H, 06H
03H, 04H
PD17225, 17226, 17227, 17228
Peripheral
address
40H
(NRZLTMM, NRZHTMM)
Address register (AR)
Peripheral hardware
Carrier generator for
remote controller
(TMC, TMM)
8-bit timer
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