P87LPC768FD datasheet(21/64 Pages) PHILIPS

21 / 64 page

Philips Semiconductors

Preliminary data

87LPC768

Low power, low price, low pin count (20 pin) microcontroller

with 4 kB OTP 8-bit A/D, Pulse Width Modulator

2001 Aug 06

• Poll PWMCON0 to find that Transfer Bit PWMCON0.6 is “0”.

When “0”:

• Write CNSW.(0:1) and CPSW.(0:4) for desired pulse widths and

counter reload values

• Set PWMCON0 to Run and Transfer

Note that if a narrow pulse on the Brake Pin causes brake to be

asserted, it may not be possible to go through the above code

before the end of the pulse. In this case, in addition to the code

shown, an external latch on the Brake Pin may be required to

ensure that there is a smooth transition in going from brake to run.

The details for PWMCON1 are shown in the following table.

PWMCON1: PWM Control register 1

Addr: 0DBH

Reset Value: 00H

BIT

SYMBOL

FUNCTION

PWMCON1.7

BKCH

See table below

PWMCON1.6

BKPS

0= ”Brake” is asserted if P0.2(Brake Pin) is low.

1= ”Brake” is asserted if P0.2(Brake Pin) is high.

PWMCON1.5

BPEN

See table below.

PWMCON1.4

BKEN

0= ”Brake” is never asserted.

1= ”Brake” is enabled per table below.

PWMCON1.3

PWM3B

0= PWM3 is low, when Brake is asserted.

1= PWM3 is high, when Brake is asserted.

PWMCON1.2

PWM2B

0= PWM2 is low, when Brake is asserted.

1= PWM2 is high, when Brake is asserted.

PWMCON1.1

PWM1B

0= PWM1 is low, when Brake is asserted.

1= PWM1 is high, when Brake is asserted.

PWMCON1.0

PWM0B

0= PWM0 is low, when Brake is asserted.

1= PWM0 is high, when Brake is asserted.

BKCH

BKPS

BPEN

BKEN

PWM3B

PWM2B

PWM1B

PWM0B

SU01388

BPEN

BKCH

BRAKE CONDITION

Always On, (Software Brake)

On when PWM not running (Brake Pin has no effect)

On when Brake Pin asserted (PWM run has no effect)

Not Allowed

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