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3: COMMANDS AND COMMAND REGISTERS
[Parameter P1]
M0
Specify the CG ROM to be used for display. Although internal CG ROM can generate 160
discrete character fonts (each consisting of 5 x 7 dots as shown in Section 4.4.1 "Character
Fonts (Internal CG)" on page 81), internal CG RAM may be used when different character
fonts or more characters (up to 256) are needed.
M0
Note: When the CG area is mapped in the display memory space, the memory area
M1
Selects the CG RAM definition area where the user can define any desired character pattern.
The CG RAM code may be selected from the 64 discrete codes assigned in Section 4.4.2
"Character Codes" on page 82.
M1
M2
Select the CG size in the Y direction for more economical use of internal CG RAM. CGs whose
sizes in the Y direction are 17 dots or more cannot be handled with the character codes of the
S1D13700. In such case, characters may be decomposed into bit images and displayed in
graphic display mode of the S1D13700.
M2
The table below summarizes bank configurations by M1, M2, and M3.
Bank configurations
M2 M1 M0
Internal
ROM
0
0
0
External
RAM
Internal
ROM
0
1
0
External
RAM
18
0: Internal CG ROM (160 characters) + internal CG RAM (64 characters)
1: Internal CG RAM (256 characters)
available to store display data is reduced by the amount of CG area mapped.
0: Without bit D6 correction The CG RAM1 and CG RAM2 areas are noncontiguous.
1: With bit D6 correction
0: 8 dots
1: 16 dots
160 characters (5 x 7 x 160)
64 characters (8 x 6 x 64)
160 characters (5 x 7 x 160)
64 characters (6 x 8 x 64)
Only CG RAM1 is handled as CG RAM, with CG RAM2
handled as CG ROM.
The CG RAM1 and CG RAM2 areas are contiguous.
Both CG RAM1 and RAM2 are handled as CG RAM.
10 – 1F
20 – 2F
30 – 3F
40 – 4F
50 – 5F
60 – 6F
70 – 7F
A0 – AF
B0 – BF
C0 – CF
D0 – DF
SAG+ { [80 – 8F], Row [2 : 0]}
[90 – 9F]
[E0 – EF]
[F0 – FF]
Same as shown above.
SAG+ { [A0 – AF], Row [2 : 0]}
[B0 – BF]
[C0 – CF]
[D0 – DF]
EPSON
Internal ROM used
Without correction
Y size = 8
Internal ROM used
With correction
Y size = 8
S1D13700 Technical Manual
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