tle92466ed::PERIOD Namespace Reference

PERIOD register bit definitions and helper functions. More...

Classes
struct	PeriodConfig
	Calculate PWM period register values from desired period in microseconds. More...

Functions
PeriodConfig	CalculateFromPeriodUs (float period_us) noexcept
	Calculate period configuration from desired period in microseconds.
constexpr uint16_t	BuildRegisterValue (const PeriodConfig &config) noexcept
	Build PERIOD register value from configuration.

Variables
constexpr uint16_t	MANT_MASK = 0x00FF
	Mantissa mask (bits 7:0)
constexpr uint16_t	EXP_MASK = 0x0700
	Exponent mask (bits 10:8)
constexpr uint16_t	EXP_SHIFT = 8
	Exponent shift.
constexpr uint8_t	EXP_VALUE_MASK = 0x07
	Exponent value mask (3 bits: 0-7)
constexpr uint16_t	LOW_FREQ_BIT = (1 << 11)
	Low frequency range bit.
constexpr uint16_t	PWM_CTRL_PARAM_SHIFT = 12
constexpr uint16_t	PWM_CTRL_PARAM_MASK = 0xF000
constexpr uint32_t	F_SYS_HZ = 28'000'000UL
	System clock frequency (28 MHz)
constexpr float	F_SYS_PERIOD_US = 1.0F / 28.0F
	System clock period (≈35.71 ns)
constexpr float	kSpecMinFrequency_Hz = 110.0F
	Datasheet minimum f_PWM.
constexpr float	kSpecMaxFrequency_Hz = 4000.0F
	Datasheet maximum f_PWM.
constexpr float	kSpecMinPeriod_us = 1.0e6F / kSpecMaxFrequency_Hz
	250 µs
constexpr float	kSpecMaxPeriod_us = 1.0e6F / kSpecMinFrequency_Hz
	9090.9 µs
constexpr float	kSpecLowRangeMinFreq_Hz = kSpecMinFrequency_Hz / 8.0F
	13.75 Hz
constexpr float	kSpecLowRangeMaxFreq_Hz = kSpecMaxFrequency_Hz / 8.0F
	500 Hz
constexpr float	kSpecLowRangeMinPeriod_us
	2000 µs
constexpr float	kSpecLowRangeMaxPeriod_us
	72727 µs
constexpr float	kSpecCombinedMinPeriod_us = kSpecMinPeriod_us
	Combined min period across both ranges (250 µs).
constexpr float	kSpecCombinedMaxPeriod_us = kSpecLowRangeMaxPeriod_us
	Combined max period across both ranges (low-range 72.7 ms).

Detailed Description

PERIOD register bit definitions and helper functions.

PWM period configuration for ICC mode.

Bit Map:

* Bit 11   : LOW_FREQ - Low frequency range (8x multiplier)
* Bits 10-8: PERIOD_EXP - Period exponent (0-7)
* Bits 7-0 : PERIOD_MANT - Period mantissa (0-255)
* 

Formulas:

• Standard: T_pwm = PERIOD_MANT × 2^PERIOD_EXP × (1/f_sys)
• Low Freq: T_pwm = PERIOD_MANT × 8 × 2^PERIOD_EXP × (1/f_sys)
• Where f_sys = 28 MHz (PLL-stabilized, see datasheet §4.2.1 Table 10 p.16), so 1/f_sys ≈ 35.714 ns (≈ 1/28 µs).

Function Documentation

BuildRegisterValue()

constexpr uint16_t tle92466ed::PERIOD::BuildRegisterValue ( const PeriodConfig &  config )

constexprnoexcept

Build PERIOD register value from configuration.

Parameters

config

Period configuration

Returns

Register value

CalculateFromPeriodUs()

PeriodConfig tle92466ed::PERIOD::CalculateFromPeriodUs ( float  period_us )

inlinenoexcept

Calculate period configuration from desired period in microseconds.

Parameters

period_us

Desired PWM period in microseconds

Returns

PeriodConfig structure, or invalid if period is out of range

Variable Documentation

EXP_MASK

constexpr uint16_t tle92466ed::PERIOD::EXP_MASK = 0x0700

constexpr

Exponent mask (bits 10:8)

EXP_SHIFT

constexpr uint16_t tle92466ed::PERIOD::EXP_SHIFT = 8

constexpr

Exponent shift.

EXP_VALUE_MASK

constexpr uint8_t tle92466ed::PERIOD::EXP_VALUE_MASK = 0x07

constexpr

Exponent value mask (3 bits: 0-7)

F_SYS_HZ

constexpr uint32_t tle92466ed::PERIOD::F_SYS_HZ = 28'000'000UL

constexpr

System clock frequency (28 MHz)

F_SYS_PERIOD_US

constexpr float tle92466ed::PERIOD::F_SYS_PERIOD_US = 1.0F / 28.0F

constexpr

System clock period (≈35.71 ns)

kSpecCombinedMaxPeriod_us

constexpr float tle92466ed::PERIOD::kSpecCombinedMaxPeriod_us = kSpecLowRangeMaxPeriod_us

constexpr

Combined max period across both ranges (low-range 72.7 ms).

kSpecCombinedMinPeriod_us

constexpr float tle92466ed::PERIOD::kSpecCombinedMinPeriod_us = kSpecMinPeriod_us

constexpr

Combined min period across both ranges (250 µs).

kSpecLowRangeMaxFreq_Hz

constexpr float tle92466ed::PERIOD::kSpecLowRangeMaxFreq_Hz = kSpecMaxFrequency_Hz / 8.0F

constexpr

500 Hz

kSpecLowRangeMaxPeriod_us

constexpr float tle92466ed::PERIOD::kSpecLowRangeMaxPeriod_us

constexpr

Initial value:

=
    1.0e6F / kSpecLowRangeMinFreq_Hz

72727 µs

kSpecLowRangeMinFreq_Hz

constexpr float tle92466ed::PERIOD::kSpecLowRangeMinFreq_Hz = kSpecMinFrequency_Hz / 8.0F

constexpr

13.75 Hz

kSpecLowRangeMinPeriod_us

constexpr float tle92466ed::PERIOD::kSpecLowRangeMinPeriod_us

constexpr

Initial value:

=
    1.0e6F / kSpecLowRangeMaxFreq_Hz

2000 µs

kSpecMaxFrequency_Hz

constexpr float tle92466ed::PERIOD::kSpecMaxFrequency_Hz = 4000.0F

constexpr

Datasheet maximum f_PWM.

kSpecMaxPeriod_us

constexpr float tle92466ed::PERIOD::kSpecMaxPeriod_us = 1.0e6F / kSpecMinFrequency_Hz

constexpr

9090.9 µs

kSpecMinFrequency_Hz

constexpr float tle92466ed::PERIOD::kSpecMinFrequency_Hz = 110.0F

constexpr

Datasheet minimum f_PWM.

kSpecMinPeriod_us

constexpr float tle92466ed::PERIOD::kSpecMinPeriod_us = 1.0e6F / kSpecMaxFrequency_Hz

constexpr

250 µs

LOW_FREQ_BIT

constexpr uint16_t tle92466ed::PERIOD::LOW_FREQ_BIT = (1 << 11)

constexpr

Low frequency range bit.

MANT_MASK

constexpr uint16_t tle92466ed::PERIOD::MANT_MASK = 0x00FF

constexpr

Mantissa mask (bits 7:0)

PWM_CTRL_PARAM_MASK

constexpr uint16_t tle92466ed::PERIOD::PWM_CTRL_PARAM_MASK = 0xF000

constexpr

PWM_CTRL_PARAM_SHIFT

constexpr uint16_t tle92466ed::PERIOD::PWM_CTRL_PARAM_SHIFT = 12

constexpr

PWM controller proportional gain lives in bits [15:12] of PERIOD per datasheet \u00a75.3.3.3. 4-bit KI value.