9

MITSUBISHI

〈DIGITAL ASSP〉

M66004SP/FP

16-DIGIT 5X7-SEGMENT VFD CONTROLLER

3. Character display

A character (refer to the character code table) which corre-

sponds to the character code transmitted from the MCU is

displayed as the designated digit.

The display digit is designated by the display digit setting

command. In case that the display digit designated by this

command is set to increase automatically, the display digit is

automatically increased by 1. After a character is displayed to

the most significant digit, it is displayed to the least significant

digit.

When the auto increment setting is canceled, the display digit

is fixed.

Ex. In order to display a character A to digits 14, 15, 16, 1 and 2 in this order

and characters A, B and C to digit 8 successively, 12-byte data must be

transmitted in the following order.

(Display digit length = 16)

OPERATION AT RESET

When a reset signal is input, the internal state is initialized as

shown in Table 4.

Table 4 Initial state

Contents

Display (characters and cursor)

Display digit length, dimmer value,

display digit, one-digit display frequency,

user character RAM state, auto incre-

ment setting

Serial receive circuit

Output port setting

Setting after reset

All digits: OFF

Values immediately

before reset are

held.

Reset

Set

1

2

3

4

5

6

7

8

9

10

11

12

Remarks

Setting of auto increment

Display digit is set to the

14th digit.

Transmission of

character code

Cancel of auto increment

setting

Display digit is set to the 8th

digit.

Transmission of

character code

Display digit

–

–

14

15

16

1

2

–

–

8

8

8

Transmission data

4. All-digit display ON/OFF

All digits are simultaneously lighted or put off by inputting all-

digit display ON command or all-digit display OFF command.

When all-digit display ON command is transmitted, all digits

including a cursor and all segments are lighted.

Therefore, this command can be used for the lamp test.

When all-digit display ON setting is canceled (normal opera-

tion mode is selected), all digits are displayed according to

the setting before all-digit display ON operation. It is also

possible to set the next character to the designated digit dur-

ing the all-digit display ON operation.

When all-digit display OFF command is transmitted, all digits

including a cursor are put off. When all-digit display OFF set-

ting is canceled (normal operation mode is selected), all dig-

its are displayed according to the setting before all-digit

display OFF operation. It is also possible to set the next char-

acter to the designated digit in the all-digit display OFF state.