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ST92F124 数据表(PDF) 205 Page - STMicroelectronics |
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ST92F124 数据表(HTML) 205 Page - STMicroelectronics |
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205 / 429 page  205/429 MULTIFUNCTION TIMER (MFT) MULTIFUNCTION TIMER (Cont’d) EXTERNAL INPUT CONTROL REGISTER (T_ICR) R250 - Read/Write Register Page: 10 Reset value: 0000 0000 (00h) Bits 7:4 = IN[3:0]: Input pin function. These bits are set and cleared by software. Bits 3:2 = A[0:1]: TxINA Pin event. These bits are set and cleared by software. Bits 1:0 = B[0:1]: TxINB Pin event. These bits are set and cleared by software. PRESCALER REGISTER (PRSR) R251 - Read/Write Register Page: 10 Reset value: 0000 0000 (00h) This register holds the preset value for the 8-bit prescaler. The PRSR content may be modified at any time, but it will be loaded into the prescaler at the following prescaler underflow, or as a conse- quence of a counter reload (either by software or upon external request). Following a RESET condition, the prescaler is au- tomatically loaded with 00h, so that the prescaler divides by 1 and the maximum counter clock is generated (Crystal oscillator clock frequency divid- ed by 6 when MODER.5 = DIV2 bit is set). The binary value programmed in the PRSR regis- ter is equal to the divider value minus one. For ex- ample, loading PRSR with 24 causes the prescal- er to divide by 25. 70 IN3 IN2 IN1 IN0 A0 A1 B0 B1 IN[3:0] bits TxINA Pin Function TxINB Input Pin Function 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 not used not used Gate Gate not used Trigger Gate Trigger Clock Up Up/Down Trigger Up Up/Down Autodiscr. Trigger Ext. Clock Trigger not used Trigger not used Trigger Ext. Clock not used Ext. Clock Trigger Clock Down Ext. Clock Trigger Down not used Autodiscr. Ext. Clock Trigger Gate A0 A1 TxINA Pin Event 0 0 1 1 0 1 0 1 No operation Falling edge sensitive Rising edge sensitive Rising and falling edges B0 B1 TxINB Pin Event 0 0 1 1 0 1 0 1 No operation Falling edge sensitive Rising edge sensitive Rising and falling edges 70 P7 P6 P5 P4 P3 P2 P1 P0 9 |
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