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MIC3003GML 数据表(PDF) 54 Page - Micrel Semiconductor |
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MIC3003GML 数据表(HTML) 54 Page - Micrel Semiconductor |
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54 / 75 page  Micrel, Inc. MIC3003 November 2009 54 M9999-111209-C hbwhelp@micrel.com or (408) 955-1690 User Control Register (USRCTL) D[7] Reserved read/write D[6] PORM read/write D[5] PORS read/write D[4] IE read/write D[3] APCSEL read/write D[2] APCSEL read/write D[1] APCSEL read/write D[0] MODSEL read/write Default value 0010 0000b = 20h Serial address A2h Byte address 254 = FEh This register provides for control of the nominal APC setpoint and management of interrupts by the end-user. APCSEL[1:0] select which of the APC setpoint registers, APCSET0, APCSET1, or APCSET2 are used as the nominal automatic power control setpoint. Similarly, MODSEL[1:0] select which of MODSET0, MODSET1, or MODSET2 are used to select the modulation level of the laser. IE must be set for any host interrupts to occur via the /INT pin. If IE is set while /INT is asserted, /INT will be deasserted immediately. PORS is always set high by any power-on reset event. If PORM is high, the power-on event will also generate a host interrupt. PORS will be cleared to zero and the interrupt output deasserted when USRCTL is read by the host. If PORM is set following the setting of PORS, PORS will remain set, and /INT will be asserted immediately. /INT will not be deasserted until USRCTL is read by the host. PORM, IE, APCSEL, and MODSEL are non-volatile and will be maintained through power and reset cycles. Bit(s) Function Operation D[7] Reserved Always write as zero; reads undefined. D[6] PORM Power-on interrupt mask 1 = POR interrupts mask enabled 0 = POR interrupts mask disabled D[5] PORS Power-on interrupt flag 1 = POR interrupt occurred 0 = No POR interrupt D[4] IE Global interrupt enable 1 = Host interrupts are enabled 0 = Host interrupts are disabled D[3:2] APCSEL Selects APC setpoint register 00 = APCSET0 01 = APCSET1 10 = APCSET2 11 = Reserved D[1:0] MODSEL Selects Modulation setpoint register 00 = MODSET0 01 = MODSET1 10 = MODSET2 11 = Reserved |
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