ST7MC1K2 datasheet(100/371 Pages) STMICROELECTRONICS

100 / 371 page

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On-chip peripherals

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

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ART counter access register (ARTCAR)

Auto-reload register (ARTARR)

PWM control register (PWMCR)

ARTCAR

Reset value: 0000 0000 (00h)

654

CA[7:0]

R/W

Table 39.

ARTCAR register description

Bit

Name

Function

7:0 CA[7:0]

Counter access data

These bits can be set and cleared either by hardware or by software. The ARTCAR

counting).

ARTARR

Reset value: 0000 0000 (00h)

654

AR[7:0]

R/W

Table 40.

ARTARR register description

Bit

Name

Function

7:0 AR[7:0]

Counter auto-reload data

These bits are set and cleared by software. They are used to hold the auto-reload

value which is automatically loaded in the counter when an overflow occurs. At the

same time, the PWM output levels are changed according to the corresponding OPx

bit in the PWMCR register.

This register has two PWM management functions:

Adjusting the PWM frequency

Setting the PWM duty cycle resolution

See below for PWM frequency versus resolution:

fPWM min/max (~0.244 kHz/31.25 kHz) = resolution (8-bit): ARTARR value 0

fPWM min/max (~0.244 kHz/62.5 kHz) = resolution (> 7-bit): ARTARR value 0..127

fPWM min/max (~0.488 kHz/125 kHz) = resolution (> 6-bit): ARTARR value 128..191

fPWM min/max (~0.977 kHz/250 kHz) = resolution (> 5-bit): ARTARR value 192..223

fPWM min/max (~1.953 kHz/500 kHz) = resolution (> 4-bit): ARTARR value 224..239

PWMCR

Reset value: 0000 0000 (00h)

654

OE[3:0]

OP[3:0]

R/W

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