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DP8570A Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # DP8570A
Description  Timer Clock Peripheral (TCP)
PDF  26 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8570A Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Functional Description
The DP8570A contains a fast access real time clock two 10
MHz 16-bit timers interrupt control logic power fail detect
logic and CMOS RAM All functions of the TCP are con-
trolled by a set of nine registers A simplified block diagram
that shows the major functional blocks is given in
Figure 1
The blocks are described in the following sections
1 Real Time Clock
2 Oscillator Prescaler
3 Interrupt Logic
4 Power Failure Logic
5 Additional Supply Management
6 Timers
The memory map of the TCP is shown in the memory ad-
dressing table The memory map consists of two 31 byte
pages with a main status register that is common to both
pages A control bit in the Main Status Register is used to
select either page
Figure 2 shows the basic concept
Page 0 contains all the clock timer functions while page 1
has scratch pad RAM The control registers are split into
two separate blocks to allow page 1 to be used entirely as
scratch pad RAM Again a control bit in the Main Status
Register is used to select either control register block
TLF8638 – 4
FIGURE 2 DP8570A Internal Memory Map
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