DS1685 Maxim, DS1685 Datasheet - Page 17

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DS1685

Manufacturer Part Number
DS1685
Description
The DS1685/DS1687 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285,DS1385, DS1485, and DS1585 PC RTCs
Manufacturer
Maxim
Datasheet

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Figure 4. Update-Ended And Periodic-Interrupt Relationship
EXTENDED FUNCTIONS
The extended functions provided by the DS1685/DS1687 that are new to the RAMified RTC family are accessed by
a software-controlled bank-switching scheme, as illustrated in Figure 5. In bank 0, the clock/calendar registers and
50 bytes of user RAM are in the same locations as for the DS1287. As a result, existing routines implemented
within BIOS, DOS, or application software packages can gain access to the DS1685/DS1687 clock registers with
no changes. Also in bank 0, an extra 64 bytes of RAM are provided at addresses just above the original locations
for a total of 114 directly addressable bytes of user RAM.
UIP
PF
UF
t
t
PI
BUC
= PERIODIC INTERRUPT TIME INTERNAL PER TABLE 3.
= DELAY BEFORE UPDATE CYCLE = 244s.
t
BUC
17 of 34
1 second
t
PI
t
PI/2
DS1685/DS1687 3V/5V Real-Time Clocks
t
PI/2

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