 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
7220 Datasheet(PDF) 111 Page - Renesas Technology Corp |
|
|
|||||||||||||||||||||||||||||
7220 Datasheet(HTML) 111 Page - Renesas Technology Corp |
|
|
111 / 303 page  2-84 7220 Group User’s Manual FUNCTIONAL DESCRIPTION 2.11 CRT display function Fig. 2.11.13 Generation timing of CRT interrupt request Fig. 2.11.14 Display state of blocks and occurrence of CRT interrupt request 2.11.5 Multi-line display The M37221M6-XXXSP/FP can ordinarily display 2 lines on the CRT screen by displaying 2 blocks at different vertical positions. In addition, it can display up to 16 lines by using a CRT interrupt. A CRT interrupt request occurs at which display of each block has been completed. In other words, character display of a certain block starts when a scanning line reaches the display position (specified by vertical position registers) for that block, and an interrupt occurs when the scanning line exceeds the block. For multi-line display, it is necessary to enable the CRT interrupt (by clearing the interrupt disable flag to “0” and setting the CRT interrupt enable bit = bit 4 at address 00FE16 to “1”). In a CRT interrupt processing routine, the character data and vertical position of the block of which display has been completed (the display as CRT interrupt cause is completed) is then replaced with the character data (contents of CRT display RAM) and display position (contents of vertical position register) for next display. Notes 1: Set the second and later block 1 display start positions of block 1 to be lower than display position of the last block 2. 2: The CRT interrupt request does not occur at the end of display when the block is not displayed. In other words, if a block is set to off display with the display control bit of the CRT control register (at address 00EA16), a CRT interrupt request does not occurs (refer to “Figure 2.11.14”). CRT interrupt request Block 1 Block 2 Block 1 , Block 2 , Block 1 (on display) Block 2 (on display) Block 2 (off display) CRT interrupt request On display (CRT interrupt request occurs at the end of block display) Off display (CRT interrupt request does not occur at the end of block display) Block 1 (off display) |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
