M35053 Datasheet, PDF (22/47 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35053-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
Encode functions (effective for NTSC only)
(1) Setting encode data
Setting data code (000 – 111) in EC0 through EC2 (bits DA8 through
DAA) of the display RAM (addresses 0 through EF16) encodes. A
sample setting and data code are shown below.
An example of setting
1H
16 bit data
LSB
MSB
(address) (Note) ^{(0) (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)}
EC2 ~ EC0= ^{100 100 100 101 001}
2 bit / a character
(Set one code of 000 to 011)
5 characters
fixed
8 characters
Set by every 2 bits (one character) with EC2 to EC0.
A suite of data code (000 – 111) for encoding to be set in EC2 through EC0 are assigned as given below.
EC2 EC1 EC0
0
0
0
Data
LL
0
0
1
LH
0
1
0
HL
0
1
1
HH
The oscillation frequency when _
encoding: 3 MHzV

1 clock cycle: 0.333µs

1 character (12 dots): 3.996µs 
2 bits/1 character: 3.996µs
1 bit: 1.998µs


1
0
0
LHLH
1
0
1
L H L ^ 18 dots

V····· 192 ! fH (horizontal synchronous
frequency)
for fH = 15.625 kHz
1
1
0
12 dots
Can not be used
1
1
1
Fig. 12 An example of data code setting
No encoding
Note: Refer to the next page about address setting.
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