ICP description

EE3046微算機原理與實作 (Microcomputers Theory and Laboratory)

ICP (In-class practice) Description

Part C. CPU Logic Circuit Design

Please finish Task 2 and 3, the execution of Test Program 1 and 2.

As instructed in the lecture, finish adding the instruction decoding part to the circuit that you designed in last week.

Test the finished circuit by running the example program specified in the lecture.

[ICP-C03-01] Practice microprogram design

Design the microinstructions, fill in µPM, and try out their execution in the dataPath circuit that you designed in last week.

Do this for the following assembly instructions:

Instruction	Number of cycles
MOV Rn,A	1

Test procedure:

Test program

mPM address

MOV A,#4EH

MOV R4,A

01H

06H

Before

After

R4 should contain 4eH.

Instruction	Number of cycles
MOV A,Rn	1

Test procedure:

Test program	mPM address
MOV A,R7	03H

Before

After

Manually fill in R7 with 9CH.

Acc should contain 9cH.

Instruction	Number of cycles
MOV A,@Ri	2

Test procedure:

Test program	mPM address
MOV A,@R1	04H, 05H

Before

After

Manually fill in data, as shown below, into RAM.

Acc should contain 8dH.

Instruction	Number of cycles
MOV @Ri,A	1

Test procedure:

Test program

mPM address

MOV A,#0EAH

MOV @R1,A

01H

15H

Before

After

Manually fill in R1 with 0dH.

RAM location 0dH should contains EAH.

[ICP-C02-01] Practice data path design

On the basis of the RAM and ALU practice result of last week, design the data path of an 8051 CPU.

Demonstrate the execution of the following instruction sequence.

MOV A,#12H

MOV R3,#67H

MOV 0EH,A

ADD A,R3

[ICP-C01-02]

Build a simple ALU

[ICP-C01-01]

Practice using RAM with "Separate load and store ports"

Part A. Assembly Programming

[ICP-A08-01]

Program name: motor direction control with simplified instruction sequence

Learning object: To learn the operating principle of motor control

Function:

The subroutine “setDirection” of Edsim51 Example 10 ( The motor.asm ) manages the motor direction control with many instructions, as indicated in Hint.

Please simplify this subrouitine so that it contains fewer instructions and also make it more understandable.

[ICP-A07-02]

Program name: Transmit a numeral ASCII after receiving it from serial input (at 19200 bps)

Learning object: To learn the operating principle of serial receiving and transmission

Function:

The processor receives ASCII bytes from the UART. When a numeral ASCII byte is received, the processor transmits the numeral ASCII byte back to the UART.

Note: First, test the program with no parity. After it works, test it with odd and even parities.

Video:

[ICP-A07-01]

Program name: Numeral test

Learning object: To learn the encoding of ASCII code

Function:

This program contains a subroutine called “numeralTest”. The subroutine tests whether the accumulator contains the ASCII code of a numeral symbol (i.e., ‘0’, ‘1’, …, or ‘9’). Before return (i.e., RET), the subroutine sets the carry flag if it is numeral; otherwise, it clears the carry flag.

Video:

[ICP-A06-02]

Program name: Transmitting Data on the 8051 Serial Port - using Interrupt

Learning object: To learn the operating principle of serial transmission

Function:

The original Example 8 program uses busy-waiting. In other words, it sends a byte to the serial port, then sits in a loop (testing the TI flag) waiting for the serial port to say it's ready for another byte.

Now please rewrite the program by making use of the serial port interrupt.

[ICP-A06-01]

Program name: Transmitting Data on the 8051 Serial Port – with odd parity

Learning object: To learn the operating principle of serial transmission

Function:

Rewrite Example 8 so that 8051 and the UART communicate with odd parity, instead of even parity as in the original Example 8.

Test the result with the UART device selecting odd, no, and even parity, respectively.

[ICP-A05-03]

Program name: keyPadScan driven by a timer interrupt

Learning object: To learn the operating principle of keypad scanning and the timer interrupt

Function:

When you execute this program, the main program will be constantly running to flash the 8 LEDs. Meanwhile, it allows you to press the keypad at any time while the main program is running.

The keypad scan is actually driven by a timer interrupt periodically every ??? ms.

The key numbers of the pressed key will be stored in a certain range of the RAM.

[ICP-A05-02]

Program name: Scanning the keypad continuously and storing the key number (without using interrupt) (preventing repeated storing)

Learning object: To learn the operating principle of keypad scanning

Function:

This ICP is to prevent repeated storing of the key number before a pressed key is released, which can happen with ICP-A05-01. The repeated-storing problem can be easily found if you set the “Update freq.” at 100 or higher. In this ICP, only once will a key number be stored into the RAM after the corresponding key is pressed.

Video:

Video note: Flag F0 indicates that some key is pressed. Flag 2FH.0 indicates that some key needs to been released.

ICP-A05-01]

; Program name: Scanning the keypad continuously and storing the key number (without using interrupt)

; Learning object: To learn the operating principle of keypad scanning

; Function:

; Example 7 stops after a key is pressed. however, in this ICP, the program won't stop.

; When a key is pressed, the key number will be stored in the RAM and then the program will keep scanning the keypad.

; The RAM area that this program uses for storing the key numbers starts from address 30H.

[ICP-A04-01]

Program name: Interrupt to change rotation direction of LED pattern

Learning object: To learn the concept of interrupt versus polling

Function:

Keep showing a rotating pattern in the LED bar. The pattern maintains either left rotation or right rotation.

When an external 0 interrupt occurs, the rotation direction will change from left rotation to right rotation or from right rotation to left rotation. SW0 when closed will issue an external 0 interrupt to the processor.

Note: 『ICP-W04-prep - poll to change rotation direction of LED pattern.asm』doesn’t work well in changing the rotation direction. Can you explain the reason.

How does ICP-W04-01 avoid this problem?

Hint: ICP-W03-01 (Program name: Example 6 with INT 1 and Timer 1) exemplifies how to set up and use the interrupt mechanism.

Video:

[ICP-A03-01]

Program name: Example 6 with INT 1 and Timer 1

Learning object: To learn how to control the interrupt and the timer

Function: This program functions the same way as Example 6 does. However, INT 1 and Timer 1 are used, instead of INT 0 and Timer 0.

[ICP-A02-03]

Program name: 7-segment display of 89AB (from L to R) & CDEF (from R to L)

Learning object: To learn the coding of 0 to F for the 7-segment display

Function: On 7-segment displays,

show 8, 9, A, and B from left to right, and then

show C, D, E, and F from right to left.

Video:

Note:

Shown below are the hexadecimal number patterns of the 7-segment display:

View the 7-segment display code.

[ICP-A02-02]

Program name: Two LEDs rotate in opposite directions

Function: This program shows a combination of two patterns. One of the two pattern is to turn on only one LED from the leftmost to the rightmost LED. The other pattern is to turn on only one LED from the rightmost to the leftmost LED.

Video:

[ICP-A02-01]

Program name: One LED rotates to the right

Function: This program shows an LED pattern in which only one LED lights up and it rotates to the right.

Video: