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ATmega32A bảng dữ liệu(PDF) 166 Page - ATMEL Corporation

tên linh kiện ATmega32A
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
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ATmega32A bảng dữ liệu(HTML) 166 Page - ATMEL Corporation

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8155B–AVR–07/09
ATmega32A
The following code examples show how to access the two registers.
Note:
1. See “About Code Examples” on page 6.
As the code examples illustrate, write accesses of the two registers are relatively unaffected of
the sharing of I/O location.
19.10.2
Read Access
Doing a read access to the UBRRH or the UCSRC Register is a more complex operation. How-
ever, in most applications, it is rarely necessary to read any of these registers.
The read access is controlled by a timed sequence. Reading the I/O location once returns the
UBRRH Register contents. If the register location was read in previous system clock cycle, read-
ing the register in the current clock cycle will return the UCSRC contents. Note that the timed
sequence for reading the UCSRC is an atomic operation. Interrupts must therefore be controlled
(for example by disabling interrupts globally) during the read operation.
Assembly Code Example(1)
:.
; Set UBRRH to 2
ldi
r16,0x02
out
UBRRH,r16
:.
; Set the USBS and the UCSZ1 bit to one, and
; the remaining bits to zero.
ldi
r16,(1<<URSEL)|(1<<USBS)|(1<<UCSZ1)
out
UCSRC,r16
:.
C Code Example
(1)
:.
/* Set UBRRH to 2 */
UBRRH = 0x02;
:.
/* Set the USBS and the UCSZ1 bit to one, and */
/* the remaining bits to zero. */
UCSRC = (1<<URSEL)|(1<<USBS)|(1<<UCSZ1);
:.



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