Intel mcs-48 manual Intellec Prompt Functional Description, MCS-48 Processors

INTELLEC PROMPT 48

FUNCTIONAL DESCRIPTION

"PROMPT" stands for PROgraMming Tool. It Is a pro- grammer for 8748 EPROMs, and a versatile aid for debugging MCS-48 programs. Programs can be entered via its Integral panel keyboard, programming socket, or serial channel. Almost any terminal can be Interfaced to the serial channel, Including a teletypewriter, CRT, or an Intellec microcomputer development system. Intellec PROMPT 48 simplifies the programming of MCS-48 systems. Like the 8748 It Is radically new, highly In- tegrated, and expandable. Like the MCS·48 family, it Is low cost, and Ideal for small applications and programs. It Is a design aid, not a development system with sophisticated software and peripherals.

MCS-48 Processors

PROMPT 48 comes complete with two of Intel'srevolu- tionary MCS-48 processors: an 8748-4 Single Compo- nent 8-Blt Microcomputer and and 8035-4 Single Compo- nent 8-Blt Microcomputer. Advances In n-channel MOS technology allow Intal, for the first tima to integrate Into one 40-pin component all computer functions:

8-blt CPU

1K x 8-blt EPROM/ROM program memory

64 x 8-bit RAM data memory

27 Input/output lines

8-blt timer/event counter

Performance - More than 90 instructions - each one or two cycles - make the single chip MCS-48 equal in performance to most multi-chip microprocessors. The MCS-48 Is an efficient controller and arithmetic pro- cessor, with extensive bit handling, binary, and BCD arithmetic instructions. These are encoded for minimum program length; 70% are single byte opera- tion codes, and none Is more than two bytes.

Flexibility - Three interchangeable, pin-compatible devices offer flexibility and low cost in development and production, as follows:

8748 - with user-programmable and erasable EPROM program memory for prototype and pre-productions systems.

8048 - with factory-programmed mask ROM memory for low-cost, high volume production.

8035 - without program memory, for use with external program memories.

Compatibility - For systems requiring additional com- patibility, the MCS-48 can be expanded with the new 8243 110 expander, 8155 I/O and 256-byte RAM, 8755 110 and 2K-byte EPROM, or 8355 110 and 2K ROM devices. MCS-48 processors readily Interface to MCS-80/85 peripherals and standard memories.

Memory Capacity

PROMPT 48 is a complefe, fully assembled and powered microcomputer system including program memory, data memory, 110, and system monitor beyond that available on MCS-48 single component computers. 1K bytes of PROMPT system RAM serve as "writable program mem- ory" - a ROM simulator for the program memory on each MCS-48 computer. 256 bytes of PROMPT system RAM serve as "external data memory," beyond the 64 register bytes on each MCS-48 computer. Users may fur- ther expand program or data memory via the panel 110 ports and bus connector.

Programming

Programs written first In assembly language, are entered In machine language and debugged with calculator-like ease on the large, Informative display and keyboard panel. Most MCS-48 operations can be specified with only two keystrokes. Once entered, routines can be exercised one Instruction (single step) or many Instructions at a time. The principal MCS-48 register - the accumulator - Is displayed while single stepping. Programs can be executed in real time (GO NO BREAK) or with as many as eight different break- points (GO WITH BREAK).

Control

PROMPT 48 can be fully controlled either by the panel keyboard and displays, or remotely by a serial channel. Thus a teletypewriter or CRT can be used but neither Is required.

Access

The PROMPT panel 110 ports and bus connector allow easy access to all MCS-48 pins except those reserved for control by the PROMPT system, namely EA external access, SS Single step, and X1, X2 clock inputs.

Circuitry - Each MCS-48 processor operates on a single + 5V supply, with internal oscillator and clock driver, and circuitry for Interrupts and resets. Extra cir- cuitry is inthe 8048 ROM processor to allow low power standby operation. The 64 x 8 RAM data memory can be independently powered.

Optional Expansion

PROMPT 48 may be expanded beyond the resources on both the MCS-48 single component computer and the PROMPT system. External program and data memory may be Interfaced and input/out ports added with the 8243 110 expander.

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