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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega162 датащи(PDF) 184 Page - ATMEL Corporation |
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ATmega162 датащи(HTML) 184 Page - ATMEL Corporation |
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184 / 324 page  184 2513K–AVR–07/09 ATmega162/V Accessing UBRRH/ UCSRC Registers The UBRRH Register shares the same I/O location as the UCSRC Register. Therefore some special consideration must be taken when accessing this I/O location. Write Access When doing a write access of this I/O location, the high bit of the value written, the USART Reg- ister Select (URSEL) bit, controls which one of the two registers that will be written. If URSEL is zero during a write operation, the UBRRH value will be updated. If URSEL is one, the UCSRC setting will be updated. The following code examples show how to access the two registers. Note: 1. The example code assumes that the part specific header file is included. As the code examples illustrate, write accesses of the two registers are relatively unaffected of the sharing of I/O location. Assembly Code Examples(1) ... ; Set UBRRH to 2 ldi r16,0x02 out UBRRH,r16 ... ; Set the USBS and ?he UCSZ1 bit to one, and ; the remaining bit? to zero. ldi r16,(1<<URSEL)|(1<<USBS)|(1<<UCSZ1) out UCSRC,r16 ... C Code Examples (1) ... /* Set UBRRH to 2 */ UBRRH = 0x02; ... /* Set the USBS and?the UCSZ1 bit to one, and */ /* the remaining bi?s to zero. */ UCSRC = (1<<URSEL)|(1<<U?BS)|(1<<UCSZ1); ... |
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