HD404629R Datasheet, PDF(84/157 Page) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

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HD404629R Datasheet, PDF (84/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

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HD404629R Series

Serial Interfaces

The serial interface serially transfers and receives 8-bit data, and includes the following features.

â¢ Multiple transmit clock sources

ï£§ External clock

ï£§ Internal prescaler output clock

ï£§ System clock

â¢ Output level control in idle states

Five registers, an octal counter, and a multiplexer are also configured for the serial interface as follows.

ï£§ Serial data register (SRL: $006, SRU: $007)

ï£§ Serial mode register A (SMRA: $005)

ï£§ Serial mode register B (SMRB: $028)

ï£§ Miscellaneous register (MIS: $00C)

ï£§ Octal counter (OC)

ï£§ Selector

The block diagram of the serial interface is shown in figure 70.

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