參數(shù)資料
型號： M37221EFSP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
中文描述： 單芯片8位CMOS微機(jī)電壓合成與屏幕顯示控制器
文件頁數(shù)： 35/61頁
文件大?。?/td> 1386K
代理商： M37221EFSP
MITSUBISHI MICROCOMPUTERS
M37221M6-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
35
The horizontal position is common to all blocks, and can be set in 64
steps (where 1 step is 4T
C
, T
C
being the display oscillation period)
as values “00
16
” to “3F
16
” in bits 0 to 5 of the horizontal position
register (address 00E0
16
). The structure of the horizontal position
register is shown in Figure 37.
The display position in the vertical direction is determined by count-
ing the horizontal sync signal (H
SYNC
). At this time, it starts to count
the rising edge (falling edge) of H
SYNC
signal from after about 1 ma-
chine cycle of rising edge (falling edge) of V
SYNC
signal. So interval
from rising edge (falling edge) of V
SYNC
signal to rising edge (falling
edge) of H
SYNC
signal needs enough time (2 machine cycles or more)
for avoiding jitter. The polarity of H
SYNC
and V
SYNC
signals can se-
lect with the CRT port control register (address 00EC
16
). For details.
refer to (8) CRT Output Pin Control.
Note:
When bits 0 and 1 of the CRT port control register (address
00EC
16
) are set to “1” (negative polarity), the vertical position
is determined by counting falling edge of H
SYNC
signal after
rising edge of V
SYNC
control signal in the microcomputer (re-
fer to Figure 35).
Fig. 35. Supplement explanation for display position
Fig. 36. Structure of vertical position register
Fig. 37. Structure of horizontal position register
Vertical position registers 1, 2
(CV1 : address 00E1
16
)
(CV2 : address 00E2
16
)
7
0
Vertical display start positions
128 steps from “00
16
” to “7F
16
”
Horizontal position register
(HR : address 00E0
16
)
Horizontal display start positions
64 steps from “00
16
” to “3F
16
”
(1 step is 4TC)
7
0
When bits 0 and 1 of the CRT port control register (address
00EC
16
) are set to “1” (negative polarity)
V
SYNC
signal input
V
control
signal in
microcomputer
Period of counting
H
SYNC
signal
0.125 to 0.25 [
μ
s]
( at f(X
IN
) = 8MHz)
(Note)
H
signal input
Not count
1
2
3
4
5
Note:
Do not generate falling edge of H
SYNC
signal near rising
edge of V
SYNC
control signal in microcomputer to avoid
jitter.
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