7220 Datasheet, PDF (91/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

FUNCTIONAL DESCRIPTION
2.10 PWM
Data bus
XIN 1/2
PW0
PWM timing
generating
circuit
Selection gate :
Connected to
black side when
reset.
Inside of
with the others.
is as same contents
PW: PWM output control register 1
PN: PWM output control register 2
D0: Port P0 direction register
PWM register
(Address : 00D01166))
b7
b0
8
8-bit PWM circuit
PWM1 register (Address : 00D116)
PWM2 register (Address : 00D216)
PWM3 register (Address : 00D316)
PWM4 register (Address : 00D416)
PWM5 register (Address : 00F616)
PN3
P00
D00
PW2
P01
D01
PW3
P02
D02
PW4
P03
D03
PW5
P04
D04
PW6
P05
D05
PW7
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
Fig. 2.10.2 8-bit PWM block diagram
2.10.1 8-bit PWM registers (addresses 00D016 to 00D416 and 00F616)
/DA registers (addresses 00CE16 and 00CF16)
Data transfer from the 8-bit PWM registers (addresses 00D016 to 00D416 and 00F616) to the 8-bit PWM
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 00CE16 and 00CF16) to the 14-bit PWM circuit is
executed when writing data to the DA-L register (address 00CF16). The output signal from the D–A output
pin corresponds to the contents of the DA latch.
Reading from the DA register (address 00CE16) means the DA latch contents. Therefore, it is possible to
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.
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7220 Group User’s Manual