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UPD17233 Datasheet(PDF) 23 Page - NEC

Part # UPD17233
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
PDF  92 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17233 Datasheet(HTML) 23 Page - NEC

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Data Sheet U14360EJ1V0DS00
µPD17230, 17231, 17232, 17233, 17234, 17235, 17236
23
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 2-9 shows the relationship between the
data buffer and peripheral hardware.
Figure 2-9.
Data Buffer and Peripheral Hardware
Data buffer
(DBF)
Internal bus
Program memory
(ROM)
Constant data
Peripheral
address
Peripheral hardware
8-bit timer
(TMC, TMM)
Carrier generator for
remote controller
(NRZLTMM, NRZHTMM)
Address register (AR)
05H, 06H
03H, 04H
40H



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