參數(shù)資料
型號: HD404458
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 87/120頁
文件大?。?/td> 692K
代理商: HD404458
HD404459 Series
87
Transmit Clock Error Detection (In External Clock Mode):
The serial interface will malfunction if a
spurious pulse caused by external noise conflicts with a normal transmit clock during transfer. A transmit
clock error of this type can be detected (figure 70).
If more than eight transmit clocks are input in transfer state, at the eighth clock including a spurious pulse
by noise, the octal counter reaches 000, the serial interrupt request flag (IFS: $023, bit 0) is set, and
transmit clock wait state is entered. At the falling edge of the next normal clock signal, the transfer state is
again entered. After the transfer is completed and IFS is reset, writing to serial mode register A (SMRA:
$005) then changes the state from transfer to STS wait. However, during the time the serial interface was in
the transfer state with the serial interrupt request flag (IFS: $023, bit 0) being set again, the error can be
detected.
Notes on Use:
Initialization after writing to registers: If port mode register A (PMRA: $004) is written to in transmit
clock wait state or in transfer state, the serial interface must be initialized by writing to serial mode
register A (SMRA: $005) again.
Serial interrupt request flag (IFS: $023, bit 0) set: For the serial interface, if the state is changed from
transfer state to another by writing to serial mode register A (SMRA: $005) or executing the STS
instruction during the first low pulse of the transmit clock, the serial interrupt request flag (IFS: $023,
bit 0) is not set. To set the serial interrupt request flag (IFS: $023, bit 0), a serial mode register A
(SMRA: $005) write or STS instruction execution must be programmed to be executed after confirming
that the
SCK
pin is at 1, that is, after executing the input instruction to port R4.
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相關代理商/技術參數(shù)
參數(shù)描述
HD404458H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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