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UPD17217GT Datasheet(PDF) 18 Page - NEC |
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UPD17217GT Datasheet(HTML) 18 Page - NEC |
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18 / 84 page  µPD17215, 17216, 17217, 17218 18 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. Fig. 2-7 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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