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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M306V2EEFS датащи(PDF) 42 Page - Renesas Technology Corp |
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M306V2EEFS датащи(HTML) 42 Page - Renesas Technology Corp |
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42 / 271 page  Rev.1.40 Oct 06, 2004 page 42 of 269 M306V2ME-XXXFP, M306V2EEFP 2.5.6 Wait Mode When a WAIT instruction is executed, the BCLK stops and the microcomputer enters the wait mode. In this mode, oscillation continues but the BCLK and watchdog timer stop. Writing “1” to the WAIT peripheral function clock stop bit and executing a WAIT instruction stops the clock being supplied to the internal peripheral functions, allowing power dissipation to be reduced. Table 2.5.3 shows the status of the ports in wait mode. Wait mode is cancelled by a hardware reset or an interrupt. If an interrupt is used to cancel wait mode, the microcomputer restarts from the interrupt routine using as BCLK, the clock that had been selected when the WAIT instruction was executed. Table 2.5.3 Port status during wait mode Pin Memory expansion mode Single-chip mode Microprocessor mode _______ _______ Address bus, data bus, CS0 to CS3 Retains status before wait mode _____ ______ ________ ________ _________ RD, WR, BHE, WRL, WRH “H” __________ HLDA,BCLK “H” ALE “H” Port Retains status before wait mode Retains status before wait mode CLKOUT When fC selected Valid only in single-chip mode Does not stop When f8, f32 selected Valid only in single-chip mode Does not stop when the WAIT peripheral function clock stop bit is “0”. When the WAIT peripheral function clock stop bit is “1”, the status immediately prior to entering wait mode is main- tained. |
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