HD404654 Datasheet, PDF (66/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404654 Series
Serial Interface 1
The MCU has one channel of serial interface. The serial interface serially transfers or receives 8-bit data,
and includes the following features.
• Multiple transmit clock sources
 External clock
 Internal prescaler output clock
 System clock
• Output level control in idle states
Serial interface 1
• Serial data register 1 (SR1L: $006, SR1U: $007)
• Serial mode register 1A (SM1A: $005)
• Serial mode register 1B (SM1B: $028)
• Port mode register A (PMRA: $004)
• Miscellaneous register (MIS: $00C)
• Octal counter (OC)
• Selector
The block diagram of serial interface 1 is shown in figure 52.
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