Intel mcs-48 manual Intellec Prompt Features, Single Component Compu.ter

INTELLEC PROMPT 48

FEATURES

Single Component Compu.ter

The 8748 is the first microcomputer fully integrated on one component . All elements of a computing system are provided, including CPU, RAM, I/O, timer, interrupts, and erasable, reprogram mabie nonvolatile program memory.

Programming Socket

PROMPT'sprogramming socket programs this revolu· tionary " smart PROM"-the 8748-in a highly reliable, convenient manner. A fail·safe interlock ensures the device is properly inserted before applying program- ming pulses. Each location may be individually pro- grammed, one byte at a time. A read-before-write programming algorithm prevents device damage by inadvertently programming unerased memory.

real time - after each instruction the MCS-48 program counter is compared against pending breakpoint!\. If no break is encountered, execution resumes. The go single step (GO SINGLE STEP) mode exercises one instruction at a time. Commands are like sentences, with param- eters separated by [i] NEXT. Eadh command ends with

[i]EXECUTE/END. In addition to the PROMPT basic commands, thirteen functions simplify programming. Each is started merely by pressing a hex datalfunction key and entering parameters as required, as shown in Table 1.

MCS·48 Processors

The execution socket accepts either an 8035 or an 8748 MCS-48 processor. Both are supplied with each PROMPT 48, and either can serve as heart of the PROMPT system. There are no processors within the PROMPT 48 mainframe, which instead contains monitor ROM and RAM, user RAM, peripherals, drivers, and sophisticated control circuitry. Once a processor is seated in the execution socket and power is applied, the PROMPT system comes to life. Various access modes may be selected such as program execution from PROMPT system RAM , or from on-chip PROM. Thus pro- grams may first be executed from PROMPT RAM with the 8035 processor. When debugging is complete, the 8035 (execution socket) processor can program the 8748 (programming socket) processor. Finally, a programmed 8748 processor .may be exercised by itself from the execution socket. The execution socket processor runs either monitor or user programs.

System Monitor

The system reset command initializes the PROMPT system and enters the monitor. The monitor interrupt command exits a user program gracefully, preserving system status and entering the monitor. The user inter- rupt command causes an interrupt only if the PROMPT system is running a user program. A comprehensive system monitor resides in four 1K-byte read only memories. It drives the PROMPT keyboard and displays and responds to commands and functions. fhe top 16 bytes of on-Chip program memory must be used by the PROMPT system to switch between monitor and user programs. It requires one level of the MCS-48 eight-level stack.

Commands

PROMPT 48'scommands are grouped and color-coded to simplify access to the 8748'sseparate program and data memory. Registers, data memory, or program mem- ory, may be examined and modified with the examine and modify commands. Then either the next or previous register and memory locations may be accessed with one keystroke. Programs may be exercised in three modes. The go no break (GO NO BREAK) runs in real time. The go with break (GO WITH BREAK) mode is not

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