Hi,
If you want to use a Freescale 8-bitter then you will need to use an external RTC say from Maxim/Dallas. Could interface using SPI or I2C.
Some application specific ones that are fairly big have an RTC but none of the general purpose ones do.
A QG8 might fit the bill, but only 16 pin (See under HCS08 menu, top left).
Regards David