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UPD72042 Datasheet(PDF) 41 Page - NEC |
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UPD72042 Datasheet(HTML) 41 Page - NEC |
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41 / 92 page  µPD72042 41 Data Sheet S14870EJ1V0DS00 [CEX] 1 : A command is currently being executed. 0 : Execution of a command has terminated. A command code can be set in CMR. The CEX flag is set and reset as described below. • Set : When a command code is set in CMR • Reset : When µPD72042 command processing is terminated [RAW] 1 : The µPD72042 is running away. 0 : The µPD72042 is not running away. The RAW flag is used to indicate a microprogram crash in the µPD72042, as detected by a watchdog timer. When the RAW flag is set to 1, a request to interrupt the microcomputer is issued. An interrupt pulse signal is output on the IRQ pin, and the IRQ flag of the FLG register is set. At this time. The microcomputer must reset the µPD72042 by driving the RESET pin of the µPD72042 low or by setting the SRST flag of the CTR register to 1. [STM] 1 : Standby mode is set. 0 : Standby mode is not set. [IRQ] 1 : An interrupt request was made. 0 : No interrupt request is made. The IRQ flag is set when a return code including the code in the RCR register is changedNote, or when the RAW flag changes from 0 to 1 (crash). When the FLG register is read with the IRQ flag set to 1, the IRQ flag is reset. For details of the return codes, see the description of the RCR register. Note IRQ flag setting depends on the IRS value of the CMR register. |
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Similar Description - UPD72042 |
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