參數(shù)資料
型號: S80C32-44:RD
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 47/152頁
文件大小: 2528K
140
2486AA–AVR–02/2013
ATmega8(L)
The following code example shows a simple USART receive function that handles both 9-bit
characters and the status bits.
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
UCSRA, RXC
rjmp
USART_Receive
; Get status and ninth bit, then data from buffer
in
r18, UCSRA
in
r17, UCSRB
in
r16, UDR
; If error, return -1
andi
r18,(1<<FE)|(1<<DOR)|(1<<PE)
breq
USART_ReceiveNoError
ldi
r17, HIGH(-1)
ldi
r16, LOW(-1)
USART_ReceiveNoError:
; Filter the ninth 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
( !(UCSRA & (1<<RXC)) )
;
/* Get status and ninth bit, then data */
/* from buffer */
status = UCSRA;
resh = UCSRB;
resl = UDR;
/* If error, return -1 */
if
( status & (1<<FE)|(1<<DOR)|(1<<PE) )
return
-1;
/* Filter the ninth bit, then return */
resh = (resh >> 1) & 0x01;
return
((resh << 8) | resl);
}
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