STMPE2403 datasheet(43/63 Pages) STMICROELECTRONICS

Part #	STMPE2403

Description	24-bit Enhanced port expander with Keypad and PWM controller Xpander logic

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STMPE2403

PWM controller

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11.3

PWM Instruction Channel x (PWMICx)

This PWMICx is the dataport that allows the instructions to be loaded into the PWM

channel. The loading of the instructions is achieved by continuously writing to this dataport.

As this dataport address falls on the non-auto increment region, continuous write operation

on I2C will write into the same dataport address. The ‘x’ value is from 0 to 2 as there are 3

independent PWM channels. To access these dataports, the corresponding ENx in the

PWMCS register must be set to 0 first to put the PWM channel in reset state.

11.4

PWM commands

The STMPE2403 PWM Controller works as a simple MCU, with program space of 64

instructions and a simple instruction set. The instructions are all 16 bits in length. The 3

most significant bits are used to identify the commands.

Bit

7654321

0

IB7

IB6

IB5

IB4

IB3

IB2

IB1

IB0

Read/Write

RW

Reset Value

0000000

0

Table 41. Bit description

Bits

Name

Description

7:0

IB[y]

PWM Instruction Channel x, where y is 7 to 0

As an instruction is 16-bit width, writing the instruction into this 8-bit PWMICx

dataport requires two 8-bit data write. The most significant byte of the 16-bit

instruction is to be written in first and followed by the least significant byte of the

instruction. The same effect applies to the read operation.

Table 42. PWM commands

Instruction

Description

RAMP

This instruction starts the PWM counters and set the pwm_x_out with the result

from the counting.

Prescale: (0 or 1)

‘0’ - divide 32KHz clock by 16

‘1’ – divide 32KHz clock by 512

Step Time: (1-63)

One ramp increment done in (step time) x (clock after prescale)

Sign: (0 or 1)

“0” – increase PWM output

‘1’ – decrease PWM output

Increment: (0-127)

The number of increment/decrement cycles

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