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MIC3003GFL bảng dữ liệu(PDF) 54 Page - Micrel Semiconductor |
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MIC3003GFL bảng dữ liệu(HTML) 54 Page - Micrel Semiconductor |
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54 / 74 page  Micrel, Inc. MIC3003GFL July 2010 54 M9999-072910-A 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 de-asserted 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 de-asserted 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 de- asserted 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 RESETOUT D[7] reserved read-only D[6] reserved read-only D[5] reserved read-only D[4] reserved read-only D[3] reserved read-only D[2] RESETOUT read/write D[1] RESETOUT read/write D[0] RESETOUT read/write Default Value 0000 0000b = 00h Serial address A2h Byte address 255 = FFh |
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