Motorola MVME187 User Manual
Functional Description
2-17
2
Battery Backed Up RAM and Clock
The MK48T08 RAM and clock chip is a 28-pin package that
provides
provides
❏
A time-of-day clock
❏
An oscillator
❏
A crystal
❏
Power fail detection
❏
Memory write protection
❏
8KB of RAM
❏
A battery
The clock provides
❏
Seconds, minutes, hours, day, date, month, and year in BCD
24-hour format
24-hour format
❏
Automatic corrections for 28-, 29- (leap year), and 30-day
months
months
No interrupts are generated by the clock.
The MK48T08 is an 8 bit device; however, the interface provided by
the PCCchip2 supports 8-, 16-, and 32-bit accesses to the MK48T08.
the PCCchip2 supports 8-, 16-, and 32-bit accesses to the MK48T08.
Refer to the MK48T08 data sheet for detailed programming
information.
information.