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SM89516IHHQV Fiches technique(PDF) 8 Page - SyncMOS Technologies,Inc |
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SM89516IHHQV Fiches technique(HTML) 8 Page - SyncMOS Technologies,Inc |
8 / 19 page May 2001 Specifications subject to change without notice,contact your sales representatives for the most recent information. 8/19 Ver 1.3 PID 89516 05/01 SyncMOS Technologies Inc. SM89516 Watch Dog Timer Registers - WDT Control Register (WDTC, $9F) WDTE: Watch Dog Timer enable bit CLEAR: Watch Dog Timer reset bit PS2 ~ PS0: clock source divider selection bit PS [2:0] Divider (OSC in) Time Period (ms) @40MHz 000 8 13.1 001 16 26.21 010 32 52.42 011 64 104.8 100 128 209.71 101 256 419.43 110 512 838.86 111 1024 1677.72 System Control Register (SCONF, $BF) The bit 7(WDR) of SCONF is Watch Dog Timer Reset bit. It will be set to 1 when reset signal generated by WDT overflow. User should check WDR bit whenever un-predicted reset happened. Reduce EMI Function The SM89516 allows user to reduce the EMI emission by setting 1 to the bit 0 (ALEI) of SCONF register. This function will inhibit the clock signal in Fosc/6Hz output to the ALE pin. This function is available when there is no external program memory or no external data RAM in the system. WDTE Unused CLEAR Unused Unused PS2 PS1 PS0 0 * 0 * * 0 0 0 WDR Unused Unused Unused Unused Unused OME ALEI 0 * * * * * 1 0 Reset value MSB LSB Reset value MSB LSB WDR: Watch Dog Timer Reset. When system reset by Watch Dog Timer overflow, WDR will be set to 1 OME: 768 bytes on-chip RAM enable bit ALEI: ALE output inhibit bit, to reduce EMI |
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