M37221 Mitsubishi, M37221 Datasheet - Page 40

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

(4) Memory for Display
There are 2 types of display memory : CRT display ROM (addresses
10000
CRT display RAM (addresses 0600
colors of characters to be displayed. The following describes each
type of display memory.
The CRT display ROM contains dot pattern data for characters to be
displayed. For characters stored in this ROM to be actually displayed,
it is necessary to specify them by writing the character code inherent
to each character (code determined based on the addresses in the
CRT display ROM) into the CRT display RAM. The character code
list is shown in Table 11.
Fig. 44. Display character stored data
40
ROM for display (addresses 10000
16
to 11FFF
10XXF
11XXF
10XX0
11XX0
16
) used to store character dot data (masked) and
or
or
16
16
16
16
b7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
16
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
to 06B7
16
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
1
to 11FFF
16
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
) used to specify the
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
16
0
0
0
1
1
0
0
0
0
0
0
0
0
0
)
0
1
b0
1
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
M37221EF-XXXSP,M37221EFSP
The CRT display ROM has a capacity of 8 K bytes. Since 32 bytes
are required for 1 character data, the ROM can stores up to 256
kinds of characters.
The CRT display ROM space is broadly divided into 2 areas. The
[vertical 16 dots]
acters are stored in addresses 10000
117FF
of display characters are stored in addresses 10800
and 11800
high-order 4 bits in the data to be written to addresses 10800
10FFF
“FX
10XXF
11XXF
10XX0
11XX0
16
+
+
+
+
”).
800
800
800
800
16
16
; the [vertical 16 dots]
and 11800
16
16
or
16
16
16
16
or
16
16
16
to 11FFF
b7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
with ON-SCREEN DISPLAY CONTROLLER
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
[horizontal (left side) 8 dots] data of display char-
16
MITSUBISHI MICROCOMPUTERS
16
to 11FFF
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
(refer to Figure 44). Note however that the
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
b3
1
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
16
[horizontal (right side) 4 dots] data
must be set to “1” (by writing data
0
0
0
1
0
0
0
0
0
0
0
0
1
1
0
0
16
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
to 107FF
b0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
and 11000
16
to 10FFF
16
16
16
to
to