STMPE2403 datasheet(45/63 Pages) STMICROELECTRONICS

45 / 63 page

STMPE2403

PWM controller

45/63

In order to enable a PWM channel, the programming sequence below should be observed.

●

The ENx of the PWMCS register should be kept in ‘0’. By default, it has a value of ‘0’.

●

Loads the instructions into the PWM channel x by writing the corresponding PWMICx.

●

The PWM channel x has a 64-word depth (16-bit width). Any instructions of size less

than or equal to 64 words can be loaded into the channel. Any attempt to load beyond

64 words will result in internal address pointer to roll-over (0x1f

◊ 0x00) and the excess

instructions to be over-written into the first address location of the channel and

onwards.

●

After the instructions are loaded in, then, the PWM channel x can be enabled by setting

a ‘1’ to the ENx bit.

●

Enables the corresponding interrupt mask bit to allow interruption to the host.

Table 44. Instruction bit

Instruction

Bit

RAMP

Prescale

0=16

1=512

Step Time

0 - 63

0 = immediate action

Sign

0=step-up

1=step-down

Increment

1 – 126

LOAD

PWM Value 0-255

GTS

BRANCH

Loop Count 0-63

Addr

Step Size

0 – 63*

END

Interrupt

to host

Reset

instructio

n counter

and

output

level to

zero

RESERVED

TRIG

Wait for Trigger

on channel 0 – 2 and external Trigger

Continues if all selected triggers present.

Each bit signifies wait for the corresponding

channel.

Send Trigger

on channel 0 – 2 and

external Trigger

Continues if no Wait for

Trigger in this

instruction.

x(1)

reserved

RESERVED

Don’t care

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