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ST72104GX Datasheet(PDF) 37 Page - STMicroelectronics |
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ST72104GX Datasheet(HTML) 37 Page - STMicroelectronics |
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37 / 141 page  ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx 37/141 MISCELLANEOUS REGISTERS (Cont’d) 10.3 MISCELLANEOUS REGISTER DESCRIPTION MISCELLANEOUS REGISTER 1 (MISCR1) Read/Write Reset Value: 0000 0000 (00h) Bit 7:6 = IS1[1:0] ei1 sensitivity The interrupt sensitivity, defined using the IS1[1:0] bits, is applied to the ei1 external interrupts. These two bits can be written only when the I bit of the CC register is set to 1 (interrupt masked). ei1: Port B (C optional) Bit 5 = MCO Main clock out selection This bit enables the MCO alternate function on the PC2 I/O port. It is set and cleared by software. 0: MCO alternate function disabled (I/O pin free for general-purpose I/O) 1: MCO alternate function enabled (fCPU on I/O port) Bit 4:3 = IS0[1:0] ei0 sensitivity The interrupt sensitivity, defined using the IS0[1:0] bits, is applied to the ei0 external interrupts. These two bits can be written only when the I bit of the CC register is set to 1 (interrupt masked). ei0: Port A (C optional) Bit 2:1 = CP[1:0] CPU clock prescaler These bits select the CPU clock prescaler which is applied in the different slow modes. Their action is conditioned by the setting of the SMS bit. These two bits are set and cleared by software Bit 0 = SMS Slow mode select This bit is set and cleared by software. 0: Normal mode. fCPU = fOSC / 2 1: Slow mode. fCPU is given by CP1, CP0 See low power consumption mode and MCC chapters for more details. 7 0 IS11 IS10 MCO IS01 IS00 CP1 CP0 SMS External Interrupt Sensitivity IS11 IS10 Falling edge & low level 0 0 Rising edge only 0 1 Falling edge only 1 0 Rising and falling edge 1 1 External Interrupt Sensitivity IS01 IS00 Falling edge & low level 0 0 Rising edge only 0 1 Falling edge only 1 0 Rising and falling edge 1 1 fCPU in SLOW mode CP1 CP0 fOSC / 4 0 0 fOSC / 8 1 0 fOSC / 16 0 1 fOSC / 32 1 1 |
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