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VR4102 Datasheet(PDF) 360 Page - NEC |
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VR4102 Datasheet(HTML) 360 Page - NEC |
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360 / 701 page  CHAPTER 17 DSU (DEADMAN’S SWITCH UNIT) 360 17.3 REGISTER SETTING FLOW The DSU register setting flow is described below. 1. Set the DSU’s count-up value (From 1 to 15 seconds). The CPU will be reset if it does not clear (1 is not written to DSUCLRREG) the timer within this time period. DSUDTMREG address : 0x0B00 00E2 data : 0x000x 2. Enable the DSU. DSUCNTREG address : 0x0B00 00E0 data : 0x0001 3. Clear the timer within the time period mentioned in step 1 above. DSUCLRREG address : 0x0B00 00E4 data : 0x0001 For normal use, repeat step 3. To obtain the current elapsed time: DSITIMREG address : 0x0B00 00E6 read (4 bits) 4. Disable the DSU for Suspend mode or a shutdown. DSUCNTREG address : 0x0B00 00E0 data : 0x0000 |
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