M37220M3-010SP MITSUBISHI [Mitsubishi Electric Semiconductor], M37220M3-010SP Datasheet - Page 22

• Manufacturer Part Number: M37220M3-010SP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER?
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Fig. 15. 14-bit PWM output example (f(X
22
[DA-H
register]
“H” level area of
fundamental waveform
14-bit
PWM output
8-bit
counter
Fundamental
waveform
b7
0
Fundamental waveform of smaller interval
“tm” which is not specified by low-order 6
bits is not changed.
14-bit PWM output
DA latch of
Low-order 6-bit output
Set “2C
b6 b5 b4 b3 b2 b1
0
FF
2C 2B 2A … 03 02 01 00
1
FE FD
16
[DA latch]
” to DA-H register.
0.25 s 44
0
=
These bits decide “H” level area of
fundamental waveform.
1
Minimum
resolution bit
width 0.25 s
At writing of DA-L
…
1
D6
b13
0
D5
0
0
IN
D4
)= 8 MHz)
b0
t
0
0
1
D3
D
H
0
High-order 8-bit
value of DA latch
0.25 s 44
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
t
…
1
1
02 01
t
2
1
0
00
t
3
b6
These bits decide smaller interval “tm” in which “H” leval
area is [“H” level area of fundamental waveform + ].
0
b5
t
1
4
0
14-bit
PWM output
8-bit
counter
= 0.25 s
t
Waveform of smaller interval “tm” specified by low-order 6 bits
5
Repeat period
T = 4096 s
1
[DA-L register]
0
At writing of DA-L
0
FF
2C 2B 2A
t
59
b0
with ON-SCREEN DISPLAY CONTROLLER
0
FE FD
t
MITSUBISHI MICROCOMPUTERS
60
0.25 s 45
Undefined
b7
…
…
Set “28
M37220M3-XXXSP
b6 b5 b4 b3 b2 b1
t
61
D6
03 02 01 00
D5
1
16
t
62
” to DA-L register.
D4
0
D3
t
1
63
…
0
0.25 s
02 01
0
b0
0
00
D
L