PC87417 Datasheet, PDF (155/257 Pages) National Semiconductor (TI) – LPC ServerI/O for Servers and Workstations

8.0 Real-Time Clock (RTC) (Continued)
Table 38. Periodic Interrupt Rate Encoding
Rate Select
3210
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Periodic Interrupt
Rate (ms)
No interrupts
3.906250
7.812500
0.122070
0.244141
0.488281
0.976562
1.953125
3.906250
7.812500
15.625000
31.250000
62.500000
125.000000
250.000000
500.000000
Divider Chain
Output
7
8
2
3
4
5
6
7
8
9
10
11
12
13
14
Revision 1.2
155
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