M37221 Mitsubishi, M37221 Datasheet - Page 46

• Manufacturer Part Number: M37221
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

(7) Multiline Display
The M37221EF-XXXSP can ordinarily display 2 lines on the CRT
screen by displaying 2 blocks at different vertical positions. In addi-
tion, it can display up to 16 lines by using CRT interrupts.
A CRT interrupt request occurs at the point at which display of each
block has been completed. In other words, when a scanning line
reaches the point of the display position (specified by the vertical
position registers) of a certain block, the character display of that
block starts, and an interrupt occurs at the point at which the scan-
ning line exceeds the block.
Note: A CRT interrupt does not occur at the end of display when
Fig. 49. Timing of CRT interrupt request
46
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)
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 reg-
ister (address 00EA
occur (refer to Figure 49).
Block 1' (on display)
Block 2' (on display)
Block 1' (off display)
Block 2' (off display)
Block 1 (on display)
Block 2 (on display)
Block 1 (on display)
Block 2 (on display)
16
), a CRT interrupt request does not
“CRT interrupt request”
“CRT interrupt request”
“CRT interrupt request”
“CRT interrupt request”
No “CRT interrupt request”
No “CRT interrupt request”
“CRT interrupt request”
“CRT interrupt request”
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
M37221EF-XXXSP,M37221EFSP
with ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS