Rainbow-electronics DS1254 Uživatelský manuál stáhnout pdf (Strana 2)

DS1254

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DESCRIPTION

The DS1254 is a fully static nonvolatile RAM (NV SRAM) (organized as 2M works by 8 bits) with built-

in real-time clock. It has a self-contained lithium energy source and control circuitry that constantly

monitors V

for an out-of-tolerance condition. When such a condition occurs, the DS1254 makes use of

an attached DS3800 battery cap to maintain clock information and preserve stored data while protecting

that data by disallowing all memory accesses. Additionally, the DS1254 has dedicated circuitry for

monitoring the status of an attached DS3800 battery cap.

The phantom clock provides timekeeping information including hundredths of seconds, seconds, minutes,

hours, day, date, month, and year information. The date at the end of the month is automatically adjusted

for months with fewer than 31 days, including correction for leap years. The phantom clock operates in

either 24-hour or 12-hour format with an AM/PM indicator.

Because the DS1254 has a total of 168 balls and only 35 active signals, balls are wired together into

groups, thus providing redundant connections for every signal.

Figure 1. PIN ASSIGNMENT

GND

A17

A18

A19

GND

A20

DQ0

DQ1

DQ2

DQ3

GND

DQ4

DQ5

DQ6

DQ7

A10

A11

GND

A12

A13

A14

A15

A16

Receptacles for DS3800

Battery Cap pins

GND

BAT

1 2 3 4 5 6 7 ... 16 17

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