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EM78M612DDP Datasheet(PDF) 11 Page - ELAN Microelectronics Corp |
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EM78M612DDP Datasheet(HTML) 11 Page - ELAN Microelectronics Corp |
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11 / 38 page  EM78M612 Universal Serial Bus Microcontroller Series This specification may change without further notice. 2004/4/28 V1.1 11 R3 (Status Register) Default Value:(0B_0001_1000) 7 6 5 4 3 2 1 0 SPRBS - PS0 T P Z DC C R3 [0] Carry flag. R3 [1] Auxiliary carry flag. R3 [2] Zero flag. It will be set to 1 when the result of an arithmetic or logic operation is zero. R3 [3] Power down flag. It will be set to 1 during Power-on phase or by “WDTC” command and cleared when the MCU enters into Power down mode. It remains in its previous state after WatchDog Reset. 1: Power-on. 0: Power down R3 [4] Time-out flag. It will be set to 1 during Power-on phase or by “WDTC” command. It is reset to 0 by WDT time-out. 1: WatchDog timer without overflow. 0: WatchDog timer with overflow. The various states of Power down flag and Time-out flag at different conditions are shown below: T P Condition 1 1 0 1 1 1 1 *P 0 0 Power-on reset WDTC instruction WDT time-out Power down mode Wakeup caused by port change during Power down mode *P: Previous status before WDT reset R3 [5] Page selection bit. This bit is used to select a page of program memory (refer to R2, Program Counter). PS0 Program Memory Page [Address] 0 Page 0 [0000-03FF] 1 Page 1 [0400-07FF] R3 [6] General purpose registers. R3 [7] Special purpose registers bank selector. 1: R8S ~ RFS; IOC8S ~ IOCFS 0: R5 ~ RF; IOC5 ~ IOCF |
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