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SM8954AC25 Folha de dados(PDF) 10 Page - SyncMOS Technologies,Inc |
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SM8954AC25 Folha de dados(HTML) 10 Page - SyncMOS Technologies,Inc |
10 / 23 page SyncMOS Technologies International, Inc. SM8954A 8-Bits Micro-controller With 16KB flash & 1KB RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. Ver 2.1 SM8954A 08/2006 10 There is a 250KHz RC oscillator embedded in chip. Set WDTE = “1” will enable the RC oscillator and the frequency is independent to the system frequency. To enable the WDT is done by setting 1 to the bit 7 (WDTE) of WDTC. After WDTE set to 1, the 16-bit counter starts to count with the RC oscillator. It will generate a reset signal when overflows. The WDTE bit will be cleared to 0 automatically when SM8958A been reset, either hardware reset or WDT reset. To reset the WDT is done by setting 1 to the CLEAR bit of WDTC before the counter overflow. This will clear the content of the 16-bit counter and let the counter re-start to count from the beginning. 3.1 Watch Dog Timer Registers: Watch Dog Timer Registers - WDT Control Register (WDTC, $9F) bit-7 bit-0 WDTE R Clear Unused Unused PS2 PS1 PS0 Read / Write: R/W - R/W - - R/W R/W R/W Reset value: 0 * 0 * * 0 0 0 WDTE : Watch Dog Timer enable bit CLEAR : Watch Dog Timer reset bit PS[2:0] : Overflow period select bits PS [2:0] Overflow Period (ms) 000 2.048 001 4.096 010 8.192 011 16.384 100 32.768 101 65.536 110 131.072 111 262.144 Watch Dog Key Register - (WDTKEY, $97H) bit-7 bit-0 WDT KEY7 WDT KEY6 WDT KEY5 WDT KEY4 WDT KEY3 WDT KEY2 WDT KEY1 WDT KEY0 Read / Write: R/W R/W R/W R/W R/W R/W R/W R/W Reset value: 0 0 0 0 0 0 0 0 |
Nº de peça semelhante - SM8954AC25 |
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Descrição semelhante - SM8954AC25 |
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