MAX6952EVKIT 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6952EVKIT

MAX6952 Evaluation Kit

Maxim Integrated 

MAX6952 Evaluation Kit

Both SRAM Data Planes P0 and P1 are displayed on

the computer monitor eight-digit 5 x 7 LED matrix and

are updated when a new hexadecimal digit value is

entered above the digit in the edit box. The program

keeps track of data written to all registers in the

MAX6952 hardware. To clear the MAX6952 P0 and P1

Plane registers, click on the Clear Planes button and

both planes are set to the blank ASCII character, hexa-

decimal value 20. Note that the EV kit is still in Normal

display mode although all of the 5 x 7 LED matrix seg-

ments are off.

Figure 1 shows the evaluation software’s Main window.

Pulldown Menus and Saving Data

All available functions, except for altering a digit’s

value, can be changed using the Pulldown menus. A

reset function is also provided in the View|Reset menu

to reinitialize the program and hardware.*

Pressing the Save Data button saves all the current

registers, P0 and P1 planes, and user-definable char-

acter data to the MAX6952.ini file. The Restore Data

button retrieves the saved registers, P0 and P1 planes,

Figure 3. Parallel Port Diagnostic Window’s Bit-Banging

Serial Interface Tab Provides Direct, Low-Level Access to

the MAX6952 Through the SPI Interface

user-definable characters data, and sends them to the

MAX6952 EV kit hardware. The Main window and User

RAM window are also restored to the saved condition.

User RAM Interface

Clicking on the User RAM button brings up the User

RAM display window (Figure 2), allowing the user to

configure all 24 user-definable characters RAM00–

RAM23. Clicking on the desired digit’s dot illuminates

the segment and automatically updates both

MAX6952’s user RAM in the EV kit with the new pattern

for that particular character. Entering the hexadecimal

value of a user-defined character in the Main window’s

plane P0 or P1 edit box displays the user-defined char-

acter. For example, entering 00 displays the character

designed at RAM00 in the user RAM window. The EV

kit’s appropriate digit is also updated with the character.

To clear all 24 user-definable characters RAM00–

RAM23, use the Clear All User RAM button. User RAM

in both MAX6952s on the EV kit is cleared. Clicking the

Exit User RAM button closes the User RAM display

window.

General-Purpose SPI Utility

There are two methods for communicating with the

MAX6952: through the Main window display or through

the general-purpose SPI utility using the View|SPI

Utility command. The utility configures the SPI parame-

ters such as clock polarity (CPOL), clock phase

(CPHA), and chip select (CS) polarity. The fields where

pin numbers are required apply to the pins of the paral-

lel port connector. When using the SPI utility, the Main

window display no longer keeps track of changes sent

to hardware. The SPI utility is preconfigured for the

proper setting of CPOL, CPHA, and CS. The EV kit and

PC program can be reinitialized to the startup screen

settings by using the View|Reset EV kit command.

The utility handles data as 8-bit hexadecimal bytes.

Data longer than 1 byte must be handled as multiple

bytes. Thus, for the MAX6952 EV kit, 16-bit words are

broken into two 8-bit bytes:

1) Click on the Bit-Banging Serial Interface tab and

set bits per byte to 8 (Figure 3).

2) Enter the command byte first and then the data byte.

3) To write data to the MAX6952 EV kit hardware, enter

the data into the Data bytes to be written field. The

data bytes must be hexadecimal and prefixed by 0x.

4) Separate each byte with a comma.

*Active and inactive dot colors can be changed using the

View|Reset Matrix color menu.

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