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UT1750AR12WCC

RISC Microprocessor

Aeroflex UTMC 

Entering the Console mode

The UT1750AR enters the Console mode in one of two ways:

• If the CONSOLE input is active (high) when the

UT1750AR is reset (MRST = 0).

• Upon executing a Breakpoint (BPT) instruction. When

the UT1750AR encounters a BPT instruction, the

UT1750AR first reads the data in the STATUS. If the

ConsoleEnablebit(bit4)intheSTATUSislow,theUT1750AR

treats the BPT instruction like a NOP. If, on the other

hand, the Console Enable bit is high, the UT1750AR

enters the Console mode and waits for the first console

ommand.

When the UT1750AR enters the Console mode, it begins

executing the program stored in the RISC PROMs. The

UT1750AR initially sets its internal UART as the default

console interface. Although the internal UART is the default

console interface, the user can select another interface, such as

a MIL-STD-1553 bus, another external serial interface, or a

parallel interface, as the console interface by changing the

programming in the RISC PROMs.

Using the Console mode

To control the UT1750AR with the Console mode, 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 UT1750AR’s Console mode are described in

detail in the following sections. The UT1750AR can receive

these Console control commands with its internal UART,

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

characters must be capitalized for the UT1750AR 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.

The Examine (E) Command

The Examine Command has four variations:

(1) EIxxxx - The Examine Instruction (RISC) memory

command. This command permits the user to examine any

memory location within the 64K instruction memory space. The

EI command is followed by the 16-bit Hex address, above as

“xxxx,” of the memory location to examine. Valid characters

for the instruction address field (xxxx) are 0-9 and A-F.

The user can examine consecutive memory locations by

repeatedly entering Space characters. The Console continues to

display the contents of contiguous memory locations until any

non-Space character is received. When the Console receives a

non-Space character, it terminates EI command execution and

waits for the next valid Console command.

(2) EOxxxx - The Examine Operand memory Command. This

command works exactly the same as the EI command except

that the user can now examine Operand memory.

(3) EExxxx - The Examine External (I/O) command. This

command works exactly the same as the EI and EO commands

except that the user can now examine any external I/O

location.

(4) ER - The Examine Register command. The Examine

Register command allows the user to look at most of the

UT1750AR’s internal registers.

After the UT1750AR has received the ER command, it displays

the contents of register R0. The user can examine additional

registers by repeatedly transmitting Space characters to the

UT1750AR. The Console mode displays the registers one after

another in the following order: R0 through R15, 1750 Status

Word (SW), Pending Interrupt Register (PI), Interrupt Mask

Register (MK), Fault Register (FT), 1750 Program Counter

(PC), 1750 Timer A (TA) and Timer B (TB). The UT1750AR

continues to display its registers until the UT1750AR receives

a non-Space character or until the UT1750AR has displayed

the complete list of registers. At this time the UT1750AR

terminates the ER command and waits for the next valid

Console command.

The Modify (M) Command

The Modify Command has four variations:

(1) MIxxxx,vvvv - The Modify Instruction (RISC) memory

command. This command permits the user to modify any

memory location within the 64K instruction memory space. The

MI command is followed by the 16-bit Hex address denoted

above as “xxxx,” of the memory location to examine and the 16

bit Hex value denoted above as “vvvv,” the user wishes to

place in this memory location. Valid characters for the

instruction address field (xxxx) and value field (vvvv) are 0-9

and A-F.

The user can modify consecutive memory locations by entering

multiple 16-bit values in the MI command. The MI command

would then take the form: MIxxxx,vvvv,vvvv,...,vvvv where the

user can enter as many new values as desired. The commas are

optional as delimiters. The UT1750AR now modifies

instruction memory starting at the given address (xxxx) and

continues to modify memory until all new values are in memory.

(2) MOxxxx,vvvv - The Modify Operand memory command.

This command works exactly the same as the MI command

except that the user can now modify Operand memory. The

form of the MO command to alter multiple Operand memory

locations is: MOxxxx,vvvv,vvvv,...,vvvv.

(3) MExxxx,vvvv - The Modify External I/O command. This

command works exactly the same as the MI and MO commands

except that the user can now modify any external I/O

location. The form of the ME command to alter multiple

external I/O locations is: MExxxx,vvvv,vvvv,...,vvvv.

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