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3886 Datasheet(PDF) 263 Page - Renesas Technology Corp |
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3886 Datasheet(HTML) 263 Page - Renesas Technology Corp |
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263 / 380 page  3886 Group User’s Manual APPLICATION 2.12 Clock generating circuit 2-146 Fig. 2.12.5 Control procedure Control procedure: To prepare for a power failure, set the relevant registers in the order shown below. Initialization CPUM (address 3B16), bit7, bit 6 CPUM (address 3B16), bit 4 0, 0 1 CPUM (address 3B16), bit7, bit 6 CPUM (address 3B16), bit5 1, 0 (Note) 1 (Note) RESET Internal system clock: f(XCIN)/2 (low-speed mode) Main clock f(XIN) oscillation stopped Note: Do not switch simultaneously. Return processing from power failure Set timer interrupt to occurs every second. Execute WIT instruction. At power failure, clock count is performed during timer interrupt processing (every second). Port XC: XCIN-XCOUT oscillation function When selecting main clock f(XIN)/2 (high-speed mode) Detect power failure ? N Y Return condition from power failure completed ? N Y qX: This bit is not used here. Set it to “0” or “1” arbitrarily. ≈ ≈ |
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