參數(shù)資料
型號: HD407A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 80/133頁
文件大小: 803K
代理商: HD407A4639R
HD404639R Series
80
Serial Communications Interface
The MCU has two channels of serial interface. The transfer and receive start instructions differ according to
the serial interface channel, but other functions are the same. 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
Five registers, an octal counter, and a multiplexer are also configured for serial interfaces 1 and 2 as
follows.
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 (OC1)
Selector
Serial interface 2
Serial data register 2 (SR2L: $01D, SR2U: $01E)
Serial mode register 2A (SM2A: $01B)
Serial mode register 2B (SM2B: $01C)
Port mode register A (PMRA: $004)
Octal counter (OC2)
Selector
The block diagram of the serial interface is shown in figure 66.
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