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2.10 PWM
The M37221M6-XXXSP/FP has one 14-bit PWM (pulse width modulator) [DA], and six 8-bit PWM [PWM0–
PWM5].
Table 2.10.1 shows the PWM function performance.
Table 2.10.1 PWM function performance (at oscillation frequency = 8 MHz)
Performance
Resolution (bits)
Minimum resolution bit width ( µ s)
Repeat cycle ( µ s)
Figure 2.10.1 shows the 14-bit PWM block diagram and Figure 2.10.2 shows the 8-bit PWM block diagram.
Fig. 2.10.1 14-bit PWM (DA) block diagram
14-bit PWM [DA]
Data bus
DA-H register
(Address : 00CE
)
16
b7
DA latch
(14 bits)
MSB
8
6
14-bit PWM circuit
X
1/2
IN
PW0
Note: The DA-L register also functions as the low-order 6 bits of the DA latch.
7220 Group User's Manual
FUNCTIONAL DESCRIPTION
14
0.25
4096
b0
LSB
6
14
PN2
PWM timing
generating
circuit
Selection gate :
Connected to
black side when
reset.
Pass gate
Inside of
with the others.
PW: PWM output control register 1
PN: PWM output control register 2
8-bit PWM
8
4
1024
DA-L register (Note)
(Address : 00CF
)
16
PN4
DA
D-A
PW1
2.10 PWM
2-63
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