M37212 Mitsubishi, M37212 Datasheet - Page 47

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

Fig. 8.7.3 14-bit PWM Timing (f(X
Rev. 1.0
[ D A - H
r e g i s t e r ]
H I G H l e v e l a r e a o f
f u n d a m e n t a l w a v e f o r m
1 4 - b i t
P W M o u t p u t
8 - b i t
c o u n t e r
F u n d a m e n t a l
w a v e f o r m
b 7
0
F u n d a m e n t a l w a v e f o r m o f s m a l l e r i n t e r v a l
“ t m ” w h i c h i s n o t s p e c i f i e d b y l o w - o r d e r 6
b i t s i s n o t c h a n g e d .
1 4 - b i t P W M o u t p u t
L o w - o r d e r 6 - b i t o u t p u t o f
D A l a t c h
S e t “ 2 C
b 6 b 5 b 4 b 3 b 2 b 1
0
2 C 2 B 2 A
F F
1
F E F D … D 6
1 6
[ D A l a t c h ]
” t o D A - H r e g i s t e r .
T h e s e b i t s d e c i d e H I G H l e v e l a r e a
o f f u n d a m e n t a l w a v e f o r m .
0 . 2 5 s 4 4
0
1
M i n i m u m
r e s o l u t i o n b i t
w i d t h 0 . 2 5 s
A t w r i t i n g o f D A - L
…
IN
b 1 3
1
0 3 0 2 0 1 0 0
0
) = 8 MHz)
D 5
0
0
D 4
b 0
0
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
t
0
1
D 3
D
H
H i g h - o r d e r 8 - b i t
v a l u e o f D A l a t c h
0
0 . 2 5 s 4 4
t
…
1
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
1
0 2 0 1
t
1
2
0
0 0
t
3
b 6
T h e s e b i t s d e c i d e s m a l l e r i n t e r v a l “ t m ” i n w h i c h H I G H l e v a l
a r e a i s [ H I G H l e v e l a r e a o f f u n d a m e n t a l w a v e f o r m + ] .
0
b 5
t
1
4
0
1 4 - b i t
P W M o u t p u t
8 - b i t
c o u n t e r
= 0 . 2 5 s
t
5
W a v e f o r m o f s m a l l e r i n t e r v a l “ t m ” s p e c i f i e d b y l o w - o r d e r 6 b i t s
R e p e a t p e r i o d
T = 4 0 9 6 s @
1
[ D A - L r e g i s t e r ]
0
A t w r i t i n g o f D A - L
0
F F
2 C 2 B 2 A
t
5 9
b 0
0
with ON-SCREEN DISPLAY CONTROLLER
F E F D
t
MITSUBISHI MICROCOMPUTERS
6 0
0 . 2 5 s 4 5
b 7
…
…
S e t “ 2 8
b 6 b 5 b 4 b 3 b 2 b 1
t
6 1
D 6
0 3 0 2 0 1 0 0
M37212EFSP/FP
1
D 5
1 6
t
6 2
” t o D A - L r e g i s t e r .
D 4
0
D 3
t
1
6 3
…
0
0 . 2 5 s
0 2 0 1
0
b 0
0
0 0
D
L
47