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-- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--
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--
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-- VHDL Units : o8_rtc
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-- VHDL Units : o8_rtc
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-- Description: Provides automatically updated registers that maintain the
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-- Description: Provides automatically updated registers that maintain the
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-- : time of day. Keeps track of the day of week, hours, minutes
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-- : time of day. Keeps track of the day of week, hours, minutes
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-- : seconds, and tenths of a second. Module is doubled buffered
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-- : seconds, and tenths of a second in packed BCD format.
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-- : to ensure time consistency during accesses. Also provides
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-- : Module is doubled buffered to ensure time consistency during
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-- : a programmable periodic interrupt timer, as well as a uSec
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-- : accesses.
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-- : tick for external use.
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-- : Also provides an 8-bit programmable periodic interrupt timer
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-- : with 1uS resolution, a 10uS fixed interrupt, as well as a
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-- : 1 uSec tick (1 clock wide) for external use.
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--
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--
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-- Register Map:
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-- Register Map:
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-- Offset Bitfield Description Read/Write
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-- Offset Bitfield Description Read/Write
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-- 0x0 AAAAAAAA Periodic Interval Timer in uS (RW)
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-- 0x0 AAAAAAAA Periodic Interval Timer in uS (RW)
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-- 0x1 -AAAAAAA Tenths (0x00 - 0x63) (RW)
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-- 0x1 BBBBAAAA Tenths (0x00 - 0x99) (RW)
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-- 0x2 --AAAAAA Seconds (0x00 - 0x3B) (RW)
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-- 0x2 -BBBAAAA Seconds (0x00 - 0x59) (RW)
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-- 0x3 --AAAAAA Minutes (0x00 - 0x3B) (RW)
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-- 0x3 -BBBAAAA Minutes (0x00 - 0x59) (RW)
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-- 0x4 ---AAAAA Hours (0x00 - 0x17) (RW)
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-- 0x4 --BBAAAA Hours (0x00 - 0x23) (RW)
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-- 0x5 -----AAA Day of Week (0x00 - 0x06) (RW)
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-- 0x5 -----AAA Day of Week (0x00 - 0x06) (RW)
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-- 0x6 -------- Update RTC regs from Shadow Regs (WO)
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-- 0x6 -------- Update RTC regs from Shadow Regs (WO)
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-- 0x7 A------- Update Shadow Regs from RTC regs (RW)
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-- 0x7 A------- Update Shadow Regs from RTC regs (RW)
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-- A = Update is Busy
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-- A = Update is Busy
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