P87LPC778FDH datasheet(23/79 Pages) PHILIPS

23 / 79 page

Philips Semiconductors

P87LPC778

CMOS single-chip 8-bit microcontroller

Product data

Rev. 01 — 31 March 2004

23 of 79

9397 750 12378

the case of two digits following ‘CPSW,’ e.g. CPSW0.0, the second digit refers to the

bit of the compare value. Thus CPSW0.0 represents the value loaded into bit 0 of the

PWM0 compare register.

The overall functioning of the PWM module is controlled by the contents of the

PWMCON0 register. The operation of most of the control bits is straightforward.

For example there is an invert bit for each output which causes results in the output to

have the opposite value compared to its non-inverted output.

The transfer of the data from the shadow registers to the control registers is

controlled by the Transfer bit; PWMCON0.6, the actual transfer will happen on the ﬁrst

underﬂow after the transfer bit is set.

The user can monitor when underﬂow causes the transfer to occur by monitoring the

Transfer bit; PWCON0.6. When the transfer takes place the PWM logic automatically

resets this bit.

The Run bit; PWMCON0.7 allows the counter of the PWM to be either in the run or

idle state.

The fact that the transfer from the shadow to the working registers only occurs when

there is an underﬂow in the counter results in the need for the user’s program to

observe the following precautions.

Table 13:

CPSW0 - Compare shadow register 0 (address 0D3H) bit allocation

Bit addressable; Reset value: 00H

Bit

Symbol

CPSW07

CPSW06

CPSW05

CPSW04

CPSW03

CPSW02

CPSW01

CPSW00

Table 14:

CPSW1 - Compare shadow register 1 (address 0D4H) bit allocation

Bit addressable; Reset value: 00H

Bit

Symbol

CPSW17

CPSW16

CPSW15

CPSW14

CPSW13

CPSW12

CPSW11

CPSW10

Table 15:

CPSW2 - Compare shadow register 2 (address 0D5H) bit allocation

Bit addressable; Reset value: 00H

Bit

Symbol

CPSW27

CPSW26

CPSW25

CPSW24

CPSW23

CPSW22

CPSW21

CPSW20

Table 16:

CPSW3 - Compare shadow register 3 (address 0D6H) bit allocation

Bit addressable; Reset value: 00H

Bit

Symbol

CPSW37

CPSW36

CPSW35

CPSW34

CPSW33

CPSW32

CPSW31

CPSW30

Table 17:

CPSW4 - Compare shadow register 4 (address 0D7H) bit allocation

Bit addressable; Reset value: 00H

Bit

Symbol

CPSW39

CPSW38

CPSW29

CPSW28

CPSW19

CPSW18

CPSW09

CPSW08

P87LPC778FDH Datasheet(PDF) 23 Page - NXP Semiconductors

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