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MC912XDP512F0CPV Datasheet(PDF) 97 Page - Freescale Semiconductor, Inc |
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MC912XDP512F0CPV Datasheet(HTML) 97 Page - Freescale Semiconductor, Inc |
97 / 1350 page Chapter 2 Clocks and Reset Generator (S12CRGV6) MC9S12XDP512 Data Sheet, Rev. 2.17 Freescale Semiconductor 97 2.3.2.12 CRG COP Timer Arm/Reset Register (ARMCOP) This register is used to restart the COP time-out period. Read: Always reads 0x_00 Write: Anytime When the COP is disabled (CR[2:0] = “000”) writing to this register has no effect. When the COP is enabled by setting CR[2:0] nonzero, the following applies: Writing any value other than 0x_55 or 0x_AA causes a COP reset. To restart the COP time-out period you must write 0x_55 followed by a write of 0x_AA. Other instructions may be executed between these writes but the sequence (0x_55, 0x_AA) must be completed prior to COP end of time-out period to avoid a COP reset. Sequences of 0x_55 writes or sequences of 0x_AA writes are allowed. When the WCOP bit is set, 0x_55 and 0x_AA writes must be done in the last 25% of the selected time-out period; writing any value in the first 75% of the selected period will cause a COP reset. 76543210 R 00000000 W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset 00000000 Figure 2-15. ARMCOP Register Diagram |
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