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Intel 8253 - Page 102

Intel 8253
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80C187
CLK, NPRD, NPWR TIMING (CKM
e
1)
27064016
CLK, RESET TIMING (CKM
e
0)
27064017
RESET must meet timing shown to guarantee known phase of internal divide by 2 circuits.
NOTE:
RESET, NPWR
, NPRD inputs are asynchronous to CLK. Timing requirements are given for testing purposes only, to assure
recognition at a specific CLK edge.
CLK, NPRD, NPWR TIMING (CKM
e
0)
27064018
RESET, BUSY TIMING
27064019
26

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