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MC9S08SH8 Datasheet(PDF) 73 Page - Freescale Semiconductor, Inc |
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MC9S08SH8 Datasheet(HTML) 73 Page - Freescale Semiconductor, Inc |
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73 / 330 page  Chapter 5 Resets, Interrupts, and General System Control MC9S08SH8 MCU Series Data Sheet, Rev. 1 Freescale Semiconductor 73 5.7.8 System Power Management Status and Control 2 Register (SPMSC2) This register is used to report the status of the low voltage warning function, and to configure the stop mode behavior of the MCU. Figure 5-10. System Power Management Status and Control 2 Register (SPMSC2) 7 6 5 4 3 210 R0 0 LVDV1 1 This bit can be written only one time after power-on reset. Additional writes are ignored. LVWV PPDF 0 0 PPDC2 2 This bit can be written only one time after reset. Additional writes are ignored. W PPDACK Power-on Reset: 0 0 0 0 0 0 0 0 LVD Reset: 0 0 u u 0 0 0 0 Any other Reset: 0 0 u u 0 0 0 0 = Unimplemented or Reserved u = Unaffected by reset Table 5-11. SPMSC2 Register Field Descriptions Field Description 5 LVDV Low-Voltage Detect Voltage Select — This write-once bit selects the low voltage detect (LVD) trip point setting. It also selects the warning voltage range. See Table 5-12. 4 LVWV Low-Voltage Warning Voltage Select — This bit selects the low voltage warning (LVW) trip point voltage. See Table 5-12. 3 PPDF Partial Power Down Flag — This read-only status bit indicates that the MCU has recovered from stop2 mode. 0 MCU has not recovered from stop2 mode. 1 MCU recovered from stop2 mode. 2 PPDACK Partial Power Down Acknowledge — Writing a 1 to PPDACK clears the PPDF bit 0 PPDC Partial Power Down Control — This write-once bit controls whether stop2 or stop3 mode is selected. 0 Stop3 mode enabled. 1 Stop2, partial power down, mode enabled. Table 5-12. LVD and LVW trip point typical values1 1 See Electrical Characteristics appendix for minimum and maximum values. LVDV:LVWV LVW Trip Point LVD Trip Point 0:0 VLVW0 = 2.74 V VLVD0 = 2.56 V 0:1 VLVW1 = 2.92 V 1:0 VLVW2 = 4.3 V VLVD1 = 4.0 V 1:1 VLVW3 = 4.6 V |
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