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EB632 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc |
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EB632 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc |
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16 / 112 page  Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2 16 Freescale Semiconductor Clock System 6.2 System Clock Mode Register (SCMR) Changes The 2K42A and 2K87M mask sets use different SCMR definitions. The following sections describe the SCMR definitions for each mask set. 6.2.1 2K42A Mask Set SCMR Field Definitions SCMR is a read-only register that is updated during power-on reset (PORESET) and provides the mode control signals to the PLLs, DLL, and clock logic. This register reflects the currently defined configuration settings. Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 — COREPDF COREMF BUSDF CPMDF Type R Reset — Bit 1617 18 192021 22 232425 26 272829 30 31 SPLLPDF SPLLMF — DLLDIS — Type R Reset — Figure 6. 2K42A Mask Set System Clock Mode Register (SCMR)—0x10C88 Table 10. 2K42A Mask Set SCMR Bit Descriptions Name Bit No. Defaults Description Settings PORESET Hard Reset — 0–1 —— Reserved COREPDF 2–3 Configuration Pins Unaffected Core PLL Pre-Division Factor Not used. COREMF 4–7 Configuration Pins Unaffected Core Multiplication Factor Not used BUSDF 8–11 Configuration Pins Unaffected 60x Bus Division Factor 0010 Bus DF = 3 0011 Bus DF = 4 0100 Bus DF = 5 All other combinations not used. CPMDF 12–15 Configuration Pins Unaffected CPM Division Factor 0001 CPM DF = 2 All other combinations are not used. SPLLPDF 16–19 Configuration Pins Unaffected SPLL Pre-Division Factor 0000 SPLL PDF = 1 0001 SPLL PDF = 2 0010 SPLL PDF = 3 0011 SPLL PDF = 4 All other combinations not used SPLLMF 20–23 Configuration Pins Unaffected SPLL Multiplication Factor 0110 SPLL MF = 12 0111 SPLL MF = 14 1000 SPLL MF = 16 1001 SPLL MF = 18 1010 SPLL MF = 20 1011 SPLL MF = 22 1100 SPLL MF = 24 1101 SPLL MF = 26 1110 SPLL MF = 28 1111 SPLL MF = 30 All other combinations not used — 24 —— Reserved DLLDIS 25 Configuration Pins Unaffected DLL Disable 0 DLL operation is enabled 1 DLL is disabled |
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