參數(shù)資料
型號： MR80C32-20/883:D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁數(shù)： 97/103頁
文件大小： 25028K
186
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Note:
The receive function example reads all the I/O Registers into the Register File before any com-
putation is done. This gives an optimal receive buffer utilization since the buffer location read will
be free to accept new data as early as possible.
Assembly Code Example
USART_Receive:
; Wait for data to be received
sbis
UCSRnA, RXCn
rjmp
USART_Receive
; Get status and 9th bit, then data from buffer
in
r18, UCSRnA
in
r17, UCSRnB
in
r16, UDRn
; If error, return -1
andi
r18,(1<<FEn)|(1<<DORn)|(1<<UPEn)
breq
USART_ReceiveNoError
ldi
r17, HIGH(-1)
ldi
r16, LOW(-1)
USART_ReceiveNoError:
; Filter the 9th bit, then return
lsr
r17
andi
r17, 0x01
ret
C Code Example
unsigned int
USART_Receive( void )
{
unsigned char
status, resh, resl;
/* Wait for data to be received */
while
( !(UCSRnA & (1<<RXCn)) )
;
/* Get status and 9th bit, then data */
/* from buffer */
status = UCSRnA;
resh = UCSRnB;
resl = UDRn;
/* If error, return -1 */
if
( status & (1<<FEn)|(1<<DORn)|(1<<UPEn) )
return
-1;
/* Filter the 9th bit, then return */
resh = (resh >> 1) & 0x01;
return
((resh << 8) | resl);
}
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