STEVAL-TCS003V1 STMicroelectronics, STEVAL-TCS003V1 Datasheet - Page 43

• Manufacturer Part Number: STEVAL-TCS003V1
• Description: BOARD DEMO EXPANDER STMPE2403
• Manufacturer: STMicroelectronics

Specifications of STEVAL-TCS003V1

• Main Purpose: Interface, GPIO Expander
• Embedded: No
• Utilized Ic / Part: STMPE2403
• Primary Attributes: 8/16/24-Bit 24-Port GPIO Expander over I2C
• Secondary Attributes: 3 8-Bit PWM Output for LEDs, Keyboard Matrix Scan, Special Key Support
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8206

STMPE2403
11.3
11.4
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 I
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.
Table 41. Bit description
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.
Table 42. PWM commands
Reset Value
Read/Write
Bits
7:0
Instruction
2
C will write into the same dataport address. The ‘x’ value is from 0 to 2 as there are 3
Bit
RAMP
Name
IB[y]
RW
IB7
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
7
0
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.
RW
IB6
6
0
RW
IB5
5
0
RW
IB4
4
0
Description
Description
RW
IB3
3
0
RW
IB2
2
0
PWM controller
RW
IB1
1
0
RW
IB0
0
0
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