Figure 1 shows the pin assignment for the 40-pin DIP device. The byte-wide bus connects directly to the onboard standard CMOS SRAM in 8K x 8, 32K x 8, and 128K x 8 densities. On the DS5000T, the T indicates the inclusion of the real-time clock. In-System Loading Perhaps the best feature of the DS5000T is that you can program it while it's still in the target system. All the SoftMicro line offers program loading via the onboard serial port, a method Dallas Semiconductor highly recommends.
Program memory occupies only the locations below the partition address boundary.
Locations above the partition address are assigned as data memory and are accessed using the standard MOVX instruction for external memory access. The range address bit defines the upper limit of embedded RAM and can only be set using the serial bootstrap loader. When the RA is set to 0, an 8-KB range is selected. When it is set to 1, a 32-KB range is selected. This software lets you totally configure the Dallas DS5000T microseries using the simple serial interface shown in Figure 3.