7220 Datasheet, PDF (97/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

FUNCTIONAL DESCRIPTION
2.10 PWM
2.10.5 8-bit PWM output control
How to control the 8-bit PWM output is described below.
The PWM0–PWM7 output pins are also used for port P00–P03 and P60–P63.
Œ Set “0” to bit 0 of the PWM output control register 1 (address 00D516) to supply the PWM count source
(this bit is cleared to “0” after reset).
 Write output data to the corresponding 8-bit PWM registers (addresses 00D016 to 00D416 and 00F616).
Ž Set the corresponding bit of the port P0 direction register to “1” to specify the output mode.
 Select the output polarity by bit 3 of the PWM output control register 2 (address 00D616). When this bit
is cleared to “0,” a positive polarity is selected; when set to “1,” a negative polarity is selected.
 By setting “1” to the corresponding bits among bits 2 to 7 of the PWM output control register 1, the pins
are given the PWM output function to output the PWM. When clearing to “0,” the pins become general-
purpose ports (ports P00–P05).
PWM Output Control Register 2
b7 b6 b5 b4 b3 b2 b1 b0
PWM output control register 2 (PN) [Address 00D616]
B
Name
Functions
After reset R W
0, 1 _{Nothing is assigned. These bits are write disable bits.}
0
R—
When these bits are read out, the values are “0.”
2 DA output polarity
selection bit (PN3)
0 : Positive polarity
1 : Negative polarity
0 RW
3 ^{PWM output polarity} 0 : Positive polarity
selection bit (PN4)
1 : Negative polarity
0 RW
4 DA general-purpose
output bit (PN5)
0 : Output LOW
1 : Output HIGH
0 RW
5 _{Nothing is assigned. These bits are write disable bits. 0 R —}
to _{When these bits are read out, the values are “0.”}
7
Fig. 2.10.7 PWM output control register 2 (address 00D616)
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7220 Group User’s Manual