7220 datasheet(97/303 Pages) RENESAS

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7220 Group User’s Manual

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.

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).

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).

b7 b6 b5 b4 b3 b2 b1 b0

PWM output control register 2 (PN) [Address 00D6

After reset RW

PWM Output Control Register 2

0, 1

Name

Functions

DA output polarity

selection bit (PN3)

0 : Positive polarity

1 : Negative polarity

PWM output polarity

selection bit (PN4)

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

DA general-purpose

output bit (PN5)

0 : Output LOW

1 : Output HIGH

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

0 : Positive polarity

1 : Negative polarity

]

R—

Fig. 2.10.7 PWM output control register 2 (address 00D616)

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