ST7PMC2N6B6(2004) データシートの表示（PDF） - STMicroelectronics

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ST7PMC2N6B6
(Rev.:2004)

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI™

STMicroelectronics 

ST7MC1/ST7MC2

MOTOR CONTROLLER (Cont’d)

s Edge-aligned Mode (CMS bit = 0)

In this operating mode, the PWM Counter counts

up to the value loaded in the 12-bit Compare Reg-

ister. Then the PWM Counter is cleared and it re-

starts counting up.

The PWM signals are set to ‘0’ when the PWM

Counter reaches, in up-counting, the correspond-

ing 13-bit Compare register value and they are set

to ‘1’ when the PWM Counter is cleared.

If the 13-bit Compare register value is greater than

the extended Compare 0 register (the 13th bit is

set to ‘0’), the corresponding PWM output signal is

held at ‘1’.

If the 13-bit Compare register value = 0, the corre-

sponding PWM output signal is held at ‘0’.

Figure 118 shows some edge-aligned PWM wave-

forms in an example where the Compare 0 register

value = 8.

Figure 118. Edge-aligned PWM Waveforms (Compare 0 Register = 8)

0

1

2

3

4

5

6

7

8

0

1

1

2

3 ‘1’

4 ‘0’

1 Compare Register value = 4

2 Compare Register value = 8

3 Compare Register value > 8

4 Compare Register value = 0

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