DP8570AN National Semiconductor, DP8570AN Datasheet - Page 6

• Manufacturer Part Number: DP8570AN
• Description: IC TIMER CLOCK PERIPHERAL 28 DIP
• Manufacturer: National Semiconductor
• Type: Timer Clock Peripheral (TCP)r

Specifications of DP8570AN

• Memory Size: 44B
• Time Format: HH:MM:SS:hh (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP8570AN

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
FIGURE 2 DP8570A Internal Memory Map
6
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
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