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ST7MC1K2 数据表(PDF) 257 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 257 Page - STMicroelectronics |
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257 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 257/371 Figure 122. Comparison between 12-bit and 8-bit PWM mode Repetition down-counter Both in center-aligned and edge-aligned modes, the four compare registers (one compare 0 and three for the U, V and W phases) are updated when the PWM counter underflow or overflow and the 8-bit repetition down-counter has reached zero. This means that data are transferred from the preload compare registers to the compare registers every N cycles of the PWM Counter, where N is the value of the 8-bit repetition register in edge -aligned mode. When using center-aligned mode, the repetition down- counter is decremented every time the PWM counter overflows or underflows. Although this limits the maximum number of repetition to 128 PWM cycles, this makes it possible to update the duty cycle twice per PWM period. As a result, the effective PWM resolution in that case is equal to the resolution we can get using edge-aligned mode, that is, one Tmtc period. When refreshing compare registers only once per PWM period in center-aligned mode, maximum resolution is 2xTmtc, due to the symmetry of the pattern. The repetition down counter is an auto-reload type; the repetition rate is maintained as defined by the MREP register value (refer to Figure 123). PWM interrupt generation A PWM interrupt is generated synchronously with the ‘U’ update event, which allows to refresh compare values by software before the next update event. As a result, the refresh rate for phases duty cycles is directly linked to MREP register setting. A signal reflecting the update events may be output on a standard I/O port for debugging purposes. Refer to Debug option on page 219 for more details. Ov b0 b7 MCMP0H b0 b7 MCMP0L b0 b7 MCMPxH b0 b7 MCMPxL Ext b0 b7 MCMP0H b0 b7 MCMP0L b0 b7 MCMPxH b0 b7 MCMPxL MPCR 12-bit PWM mode (PMS bit = 0) b0 b7 Ov Ov Ov Ext Bit not available Bit extending comparison range Equivalent bit location PWM frequency set-up Phase x duty cycle set-up PWM frequency set-up Phase x duty cycle set-up fV fW fU 8-bit PWM mode (PMS bit = 1) fX Obsolete Product(s) - Obsolete Product(s) |
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