5962F9855201QXC View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

5962F9855201QXC

RadHard MicroController

Aeroflex UTMC 

access the monitor program. An example of this technique is

accessing the monitor on a specific condition. A specific

interrupt event (e.g., memory access location 100) can generate

a hardware interrupt to the PFAIL input. Accessing the monitor

allows the software programmer to evaluate the state of the

UT69R000 and system (i.e., memory or I/O subsystem).

Figures 27 and 28 show an example.

7.1 Using The Monitor

When the UT69R000 enters the Monitor mode, it begins

executing the monitor program stored in the instruction port.

The UT69R000 initially sets its internal UART as the default

monitor interface.

To control the UT69R000 with the Monitor, the user simply

transmits a predefined set of ASCII characters over the serial

data port. The list of the predefined ASCII characters

meaningful to the UT69R000’s Monitor mode are described in

detail in the following sections. The UT69R000 can receive

these Monitor control commands with its internal UART,

decode them, and then take the appropriate action. All ASCII

characters must be capitalized for the UT69R000 to

recognize them.

The four primary ASCII control characters are E, M, C, and R.

These control characters permit the system user to Examine or

Modify instruction memory, Operand memory, external I/O,

and internal registers, Continue Execution, and Run From a set

starting location.

OSCIN

CK1

CK2

CK3

CK4

PRIMARY INSTRUCTION REGISTER

(PIR)

PIR OPEN

PIR CLOSE

STATE

FETCH

(NOP)

EXECUTE

(NOP)

EXECUTE

INTERRUPT SERVICE

COMMANDS

RA(19:0)

INTERRUPT

ADDRESS VALID

RD(15:0)

INTERRUPT

INSTRUCTION VALID

INT #

Assumes:

1. Interrupts enabled at time zero.

2. No mask bits set at time zero.

Do not care field

Figure 24. Interrupt Timing

Do not care field

29

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