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M38B53M4-059FP Datasheet(PDF) 242 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP Datasheet(HTML) 242 Page - Mitsubishi Electric Semiconductor |
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242 / 355 page  2-154 38B5 Group User’s Manual APPLICATION 2.11 Clock generating circuit Control procedure: Set the relevant registers in the order shown below to prepare for a power failure. Fig. 2.11.5 Control procedure Initialization CPUM (address 003B16), bit 6 CPUM (address 003B16), bit 4 0 1 CPUM (address 003B16), bit 7 CPUM (address 003B16), bit 5 1 (Note) 1 (Note) RESET Internal system clock: f(XCIN) (low-speed mode) Main clock f(XIN) oscillation stopped Note: Do not switch at one time. Return processing from power failure Set so that timer interrupt occurs every one second Execute WIT instruction At a power failure, clock count is performed during timer interrupt processing (every second). Port XC: XCIN-XCOUT oscillation function When selecting main clock f(XIN) (high-speed mode) Detect power failure ? N Y Return condition from power failure concluded ? N Y qX: This bit is not used here. Set it to “0” or “1” arbitrarily. ≈ ≈ |
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