參數(shù)資料
型號: HD404448
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 79/123頁
文件大小: 726K
代理商: HD404448
HD404449 Series
79
Serial 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 (OC)
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 (OC)
Selector
The block diagram of serial interfaces 1 and 2 are shown in figure 66.
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