M37212 Mitsubishi, M37212 Datasheet - Page 57

• Manufacturer Part Number: M37212
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
• Manufacturer: Mitsubishi

Fig. 8.10.5 Supplement Explanation for Display Position
Rev. 1.0
The vertical display start position is determined by counting the hori-
zontal sync signal (H
positive polarity (negative polarity), it starts to count the rising edge
(falling edge) of H
(falling edge) of V
edge) of V
needs enough time (2 machine cycles or more) for avoiding jitter.
The polarity of H
port control register (address 00EC
SYNC
signal to rising edge (falling edge) of H
SYNC
SYNC
SYNC
SYNC
and V
signal. So interval from rising edge (falling
signal from after fixed cycle of rising edge
). At this time, when V
SYNC
N o t e s 1 : T h e v e r t i c a l p o s i t i o n i s d e t e r m i n e d b y c o u n t i n g f a l l i n g e d g e o f H
P e r i o d o f c o u n t i n g
H
H
s i g n a l i n p u t
V
V
s i g n a l i n
m i c r o c o m p u t e r
W h e n b i t s 0 a n d 1 o f t h e C R T p o r t c o n t r o l r e g i s t e r
( a d d r e s s 0 0 E C
S Y N C
S Y N C
S Y N C
S Y N C
8 m a c h i n e c y c l e s
o r m o r e
signals can select with the CRT
16
2 : D o n o t g e n e r a t e f a l l i n g e d g e o f H
3 : T h e p u l s e w i d t h o f V
s i g n a l i n p u t
c o n t r o l
s i g n a l
).
s i g n a l a f t e r r i s i n g e d g e o f V
V
m o r e .
S Y N C
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
1 6
SYNC
) a r e s e t t o “ 1 ” ( n e g a t i v e p o l a r i t y )
c o n t r o l s i g n a l i n m i c r o c o m p u t e r t o a v o i d j i t t e r .
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
and H
SYNC
( S e e n o t e 2 )
SYNC
S Y N C
signal
8 m a c h i n e c y c l e s
o r m o r e
1
are
N o t c o u n t
( a t f ( X
a n d H
0 . 2 5 t o 0 . 5 0 [ s ]
S Y N C
2
I N
S Y N C
3
c o n t r o l s i g n a l i n t h e m i c r o c o m p u t e r .
S Y N C
) = 8 M H z )
n e e d s 8 m a c h i n e c y c l e s o r
4
s i g n a l n e a r r i s i n g e d g e o f
5
with ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
S Y N C
M37212EFSP/FP
57