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PC87303 Datasheet(PDF) 94 Page - National Semiconductor (TI) |
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PC87303 Datasheet(HTML) 94 Page - National Semiconductor (TI) |
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94 / 114 page  90 Keyboard Controller and Real-Time Clock (Continued) 9210 Control Registers The four Control Registers used to configure timing inter- rupts can be accessed at any time during non-battery backed operation These Control Registers are located at addresses 0Ah 0Bh 0Ch and 0Dh Their descriptions fol- low Control Register A UIP DV2 DV1 DV0 RS3 RS2 RS1 RS0 bit 7 6 5 4 3210 Bits 0 – 3 RS3 – 0Periodic Interrupt Rate Select (ReadWrite) These bits control the rate of the periodic inter- rupt Reset has no effect on these bits RS3–0 Periodic Interrupt Rate 0000 None 0001 390625 ms 0010 78125 ms 0011 122070 m s 0100 244141 m s 0101 488281 m s 0110 976562 m s 0111 1953125 ms 1000 390625 ms 1001 78125 ms 1010 15625 ms 1011 3125 ms 1100 625 ms 1101 125 ms 1110 250 ms 1111 500 ms Bits 4 – 6 DV2 – 0Divider Chain Control (ReadWrite) These bits control the configuration of the divider chain in the Timing Generation function Reset has no effect on these bits DV2–0 Divider Chain Configuration 000 Oscillator Disabled 001 Oscillator Disabled 010 Normal Operation 011 TEST 100 TEST 101 TEST 110 Divider Chain RESET 111 Divider Chain RESET Bit 7 UIPUpdate in Progress (Read Only) 1 Signifies that the timing registers will be updat- ed within 244 ms 0 Signifies that an update will not occur before 244 ms This bit reads 0 when bit 7 of Control Register B (SET) is a 1 Reset has no effect on this bit Control Register B SET PIE AIE UIE 0 DM 2412 DSE bit 7 6 5 4 3 2 1 0 Bit 0 DSEDaylight Savings Enable (ReadWrite) 1 Enables daylight savings Two conditions ap- ply as follows Daylight Savings Spring Time advances from 15959 to 30000 on the first Sunday in April Daylight Savings Fall Time advances from 15959 to 10000 on the last Sunday in Octo- ber 0 Disables the daylight savings feature Reset has no effect on this bit Bit 1 241224 or 12 Hour Mode (ReadWrite) 1 Enables 24 hour format 0 Enables 12 hour format Reset has no effect on this bit 94 |
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