Rainbow-electronics DS1315 Uživatelský manuál stáhnout pdf (Strana 5)

DS1315

041697 5/22

When the ROM/RAM pin is connected to V

CCO

, the con-

troller is set in the ROM mode. Since ROM is a read–

only device that retains data in the absence of power,

battery backup and write protection is not required. As a

result, the chip enable logic will force CEO

low when

power fails. However, the Time Chip does retain the

same internal nonvolatility and write protection as de-

scribed in the RAM mode. A typical ROM/Time Chip in-

terface is illustrated in Figure 4.

DS1315 TO RAM/TIME CHIP INTERFACE Figure 3

CMOS STATIC RAM

A0 – AN

DATA I/O

DS1315

CEO

CEI

RST

BAT

CCO

CCI

ROM/

RAM

BAT

32.768 KHz

A0 – AN

D0 – D7

RST

1 2 3 4 5 6 7 8 9 10 ... 21 22

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Rainbow-electronics DS1315 Uživatelský manuál Strana 5