EM357-RTR datasheet(138/240 Pages) ETC2

Part #	EM357-RTR

Description	High-Performance, Integrated ZigBee/802.15.4 System-on-Chip

PDF	240 Pages

Scroll/Zoom	100%

Manufacturer	ETC2 [List of Unclassifed Manufacturers]

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138 / 240 page

EM351 / EM357

9.3.9.3

PWM Center-Aligned Mode

Center-aligned mode is active except when the TIM_CMS bits in the TIMx_CR1 register are 00 (all

configurations where TIM_CMS is non-zero have the same effect on the OCyREF/OCy signals). The compare flag

is set when the counter counts up, when it counts down, or when it counts up and down, depending on the

TIM_CMS bits configuration. The direction bit (TIM_DIR) in the TIMx_CR1 register is updated by hardware and

must not be changed by software. Refer to the Center-Aligned Mode (Up/Down Counting) section for more

information.

Figure 9-23 shows some center-aligned PWM waveforms in an example where:

TIMx_ARR = 8

PWM mode is the PWM mode 1

The output compare flag is set when the counter counts down corresponding to the center-aligned mode 1

selected for TIM_CMS = 01 in the TIMx_CR1 register

Figure 9-23. Center-Aligned PWM Waveforms (ARR = 8)

9-18

120-035X-000D

Preliminary

EM357-RTR Datasheet(PDF) 138 Page - List of Unclassifed Manufacturers