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ST72511R 数据表(PDF) 46 Page - STMicroelectronics |
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ST72511R 数据表(HTML) 46 Page - STMicroelectronics |
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46 / 164 page  ST72311R, ST72511R, ST72512R, ST72532R 46/164 MISCELLANEOUS REGISTERS (Cont’d) 9.3 MISCELLANEOUS REGISTERS MISCELLANEOUS REGISTER 1 (MISCR1) Read/Write Reset Value: 0000 0000 (00h) Bit 7:6 = IS1[1:0] ei2 and ei3 sensitivity The interrupt sensitivity, defined using the IS1[1:0] bits, is applied to the following external interrupts: - ei2 (port B3..0) - ei3 (port B7..4) These 2 bits can be written only when I1 and I0 of the CC register are both set to 1 (level 3). Bit 5 = MCO Main clock out selection This bit enables the MCO alternate function on the PF0 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 (fOSC/2on I/O port) Note: To reduce power consumption, the MCO function is not active in ACTIVE-HALT mode. Bit 4:3 = IS2[1:0] ei0 and ei1 sensitivity The interrupt sensitivity, defined using the IS2[1:0] bits, is applied to the following external interrupts: - ei0 (port A3..0) - ei1 (port F2..0) These 2 bits can be written only when I1 and I0 of the CC register are both set to 1 (level 3). 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 Section 7.2 ”SLOW MODE” on page 34 and Section 10.2 ”MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK TIMER (MCC/RTC)” on page 52 for more details. 70 IS11 IS10 MCO IS21 IS20 CP1 CP0 SMS IS11 IS10 External Interrupt Sensitivity MISCR2.IPB=0 MISCR2.IPB=1 00 Falling edge & low level Rising edge & high level 0 1 Rising edge only Falling edge only 1 0 Falling edge only Rising edge only 1 1 Rising and falling edge IS11 IS10 External Interrupt Sensitivity 0 0 Falling edge & low level 0 1 Rising edge only 1 0 Falling edge only 1 1 Rising and falling edge IS21 IS20 External Interrupt Sensitivity MISCR2.IPA=0 MISCR2.IPA=1 00 Falling edge & low level Rising edge & high level 0 1 Rising edge only Falling edge only 1 0 Falling edge only Rising edge only 1 1 Rising and falling edge IS21 IS20 External Interrupt Sensitivity 0 0 Falling edge & low level 0 1 Rising edge only 1 0 Falling edge only 1 1 Rising and falling edge 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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