DS5000_06 Datasheet, PDF (5/19 Pages) Dallas Semiconductor – Soft Microcontroller Module

DS5000(T) LOGICAL ADDRESS SPACES Figure 2
DS5000(T)
PROGRAM LOADING
The Program Load Modes allow initialization of the NV RAM Program/Data Memory. This initialization
may be performed in one of two ways:
1. Serial Program Loading that can perform Bootstrap Loading of the DS5000(T). This feature allows
the loading of the application program to be delayed until the DS5000(T) is installed in the end
system. Dallas Semiconductor strongly recommends the use of serial program loading because of its
versatility and ease of use.
2. Parallel Program Load cycles that perform the initial loading from parallel address/data information
presented on the I/O port pins. This mode is timing-set compatible with the 8751H microcontroller
programming mode.
The DS5000(T) is placed in its Program Load configuration by simultaneously applying a logic 1 to the
RST pin and forcing the PSEN line to a logic 0 level. Immediately following this action, the DS5000(T)
will look for a parallel Program Load pulse, or a serial ASCII carriage return (0DH) character received at
9600, 2400, 1200, or 300 bps over the serial port.
The hardware configurations used to select these modes of operation are illustrated in Figure 3.
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