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FUNCTIONAL DESCRIPTION
2.10 PWM
Selection gate :
Connected to
black side when
reset.
Inside of
is as same contents
with the others.
PW: PWM output control register 1
PN: PWM output control register 2
D0: Port P0 direction register
Fig. 2.10.2 8-bit PWM block diagram
2.10.1 8-bit PWM registers (addresses 00D0
/DA registers (addresses 00CE
Data transfer from the 8-bit PWM registers (addresses 00D0
circuit is executed when writing data to the registers. The output signal from the 8-bit PWM output pin
corresponds to the contents of this register.
Also, data transfer from the DA registers (addresses 00CE
executed when writing data to the DA-L register (address 00CF
pin corresponds to the contents of the DA latch.
Reading from the DA register (address 00CE
confirm the data being output from the D-A output pin by reading the DA register.
The contents of the 8-bit PWM register and DA register are indeterminate after reset.
2-64
Data bus
X
1/2
IN
PW0
PWM register
(Address : 00D0
)
)
16
16
b7
8
8-bit PWM circuit
PWM1 register (Address : 00D1
PWM2 register (Address : 00D2
PWM3 register (Address : 00D3
PWM4 register (Address : 00D4
PWM5 register (Address : 00F6
to 00D4
16
and 00CF
)
16
16
) means the DA latch contents. Therefore, it is possible to
16
7220 Group User's Manual
PWM timing
generating
circuit
b0
PN3
P0
0
PW2
P0
1
PW3
)
16
P0
2
PW4
)
16
P0
3
PW5
)
16
P0
4
PW6
)
16
P0
5
PW7
)
16
and 00F6
)
16
16
to 00D4
and 00F6
16
16
and 00CF
) to the 14-bit PWM circuit is
16
16
). The output signal from the D–A output
16
PWM0
D0
0
PWM1
D0
1
PWM2
D0
2
PWM3
D0
3
PWM4
D0
4
PWM5
D0
5
) to the 8-bit PWM
16
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