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32182 Datasheet(PDF) 59 Page - Renesas Technology Corp |
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32182 Datasheet(HTML) 59 Page - Renesas Technology Corp |
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59 / 755 page  2 2-14 32182 Group User’s Manual (Rev.1.0) CPU 2.7 Supplementary Explanation for BSET, BCLR, LOCK and UNLOCK Instruction Execution The LOCK bit is set when executing the BSET or BCLR instruction, and is cleared when the BSET or BCLR instruction finishes. The LOCK instruction sets the LOCK bit, as well as performs an ordinary load operation. The UNLOCK instruction is used to clear the LOCK bit. The LOCK bit is located inside the CPU, and cannot directly be accessed for read or write by users. This bit controls granting of bus control requested by devices other than the CPU. • When LOCK bit = "0" Control of the bus requested by devices other than the CPU is granted • When LOCK bit = "1" Control of the bus requested by devices other than the CPU is denied In the 32182 group, control of the bus may be requested by devices other than the CPU in the following two cases: • When DMA transfer is requested by the internal DMAC • When HREQ# input is pulled low to request that the CPU be placed in a hold state 2.7 Supplementary Explanation for BSET, BCLR, LOCK and UNLOCK Instruction Execution |
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