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EM78M612AAM Datasheet(PDF) 10 Page - ELAN Microelectronics Corp |
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EM78M612AAM Datasheet(HTML) 10 Page - ELAN Microelectronics Corp |
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10 / 38 page  EM78M612 Universal Serial Bus Microcontroller Series This specification may change without further notice. 2004/4/28 V1.1 10 8.2.1.1 Operation Registers in Bank 0 The following introduces each of the Operation Registers under the Special Purpose Registers in Bank 0. These Operation Registers are arranged according to the order of registers’ address. Note that some registers are read only, while others are both readable and writable. R0 (Indirect Address Register) Default Value: (0B_0000_0000) R0 is not a physically implemented register. Its major function is to be an indirect address pointer. Any instruction using R0 as a pointer actually accesses the data pointed by the RAM Select Register (R4). R1 (Time / Clock Counter) Default Value: (0B_0000_0000) This register TCC, is an 8-bit timer or counter. It is readable and writable as any other register. After Power-on reset and WatchDog reset, the initial value of this register is 0x00. R2 (Program Counter & Stack) Default Value: (0B_0000_0000) The EM78M612 Program Counter is an 11-bit long register that allows access to 2K bytes of Program Memory. The Program Counter is cleared after Power-on reset or WatchDog reset. The first instruction that is executed after a reset is located at Address 00h. 0x0400 0x07FF Page 1 0x03FF Page 0 0x000A 0x0001 0x0000 USB Interrupt Vector R2[9] ~ R2[0] Interrupt Vector RET RETL RETI CALL Stack 5 Stack 4 Stack 3 Stack 2 Stack 1 Reset Vector R3[5] |
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