7220 datasheet(96/303 Pages) RENESAS

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7220 Group User’s Manual

2.10 PWM

2.10.4 14-bit PWM output control

How to control the 14-bit PWM output is described below.

Set “0” to bit 0 of PWM output control register 1 (address 00D516) to supply the PWM count source (this

bit is cleared to “0” when reset).

Set the high-order 8 bits of the output data to the DA-H register.

Set the low-order 6 bits of the output data to the DA-L register.

Data is written to the 14-bit PWM circuit by writing data to the DA-L register.

For this reason, even when changing only the high-order 8 bits of the output data, be sure to write the

low-order 6 bits data to the DA-L register again.

Conversely, when changing low-order 6 bits only, it needs to only write data to the DA-L register, and

needs not write the high-order 8-bit data again.

Select the output polarity by bit 2 of PWM output control register 2 (address 00D616). When setting to

“0,” a positive polarity is selected; when “1,” a negative polarity is selected.

14-bit PWM is output from the D-A pin by clearing bit 1 of PWM output control register 1 to “0.” When

setting to “1,” pin D-A functions as a 1-bit general-purpose output port. In this case, it is possible to

specify either HIGH output (= “1”) or LOW output(= “0”) output by bit 4 of PWM output control register

Fig. 2.10.6 PWM output control register 1 (address 00D516)

b7 b6 b5 b4 b3 b2 b1 b0

PWM output control register 1 (PW) [Address 00D5

After reset RW

PWM Output Control Register 1

Name

Functions

DA, PWM count source

selection bit (PW0)

0 : Count source supply

1 : Count source stop

P00/PWM0 output

selection bit (PW2)

0: P00 output

1: PWM0 output

P01/PWM1 output

selection bit (PW3)

0: P01 output

1: PWM1 output

P02/PWM2 output

selection bit (PW4)

0: P02 output

1: PWM2 output

P03/PWM3 output

selection bit (PW5)

0: P03 output

1: PWM3 output

P04/PWM4 output

selection bit (PW6)

0: P04 output

1: PWM4 output

DA/PN4 output

selection bit (PW1)

0 : DA output

1 : PN4 output

P05/PWM5 output

selection bit (PW7)

0: P05 output

1: PWM5 output

]

FUNCTIONAL DESCRIPTION

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