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ST7MC1K2 数据表(PDF) 215 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 215 Page - STMicroelectronics |
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215 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 215/371 prescaler contents can be incremented/decremented at the next commutation event by setting the RMI (decrement) or RPI (increment) bits in the MISR register. When this method is used, at the next commutation event the prescaler value is updated but also all the MTIM timer-related registers are shifted in the appropriate direction to keep their value. After it has been taken into account, (at commutation) the RPI or RMI bit is reset by hardware. See Table 96. Only one update per step is allowed, so if both RPI and RMI bits are set simultaneously by software, there is no effect on the MISR register: the write access to these two bits together is not taken into account and the previous state is upheld. This means that if either RPI or RMI bits were set before the write access of both bits at the same time, this bit (RPI or RMI) is kept at 1. If neither bit was set before the simultaneous write access, neither of them are set after the write access. In switched mode, BEMF and demagnetization detection are already possible in order to pass in autoswitched mode as soon as possible but Z and D events do not affect the timer contents. In this mode, if an MTIM overflow occurs, it restarts counting from 0x00h and the OI overflow flag in the MCRC register is set if the TES[1:0] bits = 00. Caution: In this mode, MCOMP must never be written to 0. Table 96. Step update Mode TES[1:0] CKE bit SWA bit Clock state Read Ratio increment (slow down) Ratio decrement (speed up) xxx 0 x Disabled Write the ST[3:0] value directly in the MPRSR register Switched 00 1 0 Enabled Set RPI bit in the MISR register until next commutation Set RMI bit in the MISR register until next commutation Autoswitched 00 1 1 Enabled Automatically updated according to MZREG value Speed measure 01 10 11 1 x Enabled Obsolete Product(s) - Obsolete Product(s) |
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