參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計算機(jī))
文件頁數(shù): 89/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
89
Registers for Serial Interface
The serial interface operation is selected, and serial data is read and written by the following registers.
Serial mode register A (SMRA: $005)
Serial mode register B (SMRB: $028)
Serial data register (SRL: $006, SRU: $007)
Port mode register A (PMRA: $004)
Miscellaneous register (MIS: $00C)
Serial Mode Register A (SMRA: $005):
This register has the following functions (figure 71).
R4
1
/
SCK
pin function selection
Transmit clock selection
Prescaler division ratio selection
Serial interface initialization
Serial mode register A (SMRA: $005) is a 4-bit write-only register. It is reset to $0 by MCU reset.
A write signal input to serial mode register A (SMRA: $005) discontinues the input of the transmit clock to
the serial data register (SRL: $006, SRU: $007) and octal counter, and the octal counter is reset to 000.
Therefore, if a write is performed during data transfer, the serial interrupt request flag (IFS: $023, bit 0) is
set.
Written data is valid from the second instruction execution cycle after the write operation, so the STS
instruction must be executed at least two cycles after that.
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