參數(shù)資料
型號: MQ80C154-16P883
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44
文件頁數(shù): 91/142頁
文件大?。?/td> 61013K
代理商: MQ80C154-16P883
180
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
SPITransfer_Fast:
sts
USIDR,r16
ldi
r16,(1<<USIWM0)|(0<<USICS0)|(1<<USITC)
ldi
r17,(1<<USIWM0)|(0<<USICS0)|(1<<USITC)|(1<<USICLK)
sts
USICR,r16 ; MSB
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16
sts
USICR,r17
sts
USICR,r16 ; LSB
sts
USICR,r17
lds
r16,USIDR
ret
21.3.3
SPI Slave Operation Example
The following code demonstrates how to use the USI module as a SPI Slave:
init:
ldi
r16,(1<<USIWM0)|(1<<USICS1)
sts
USICR,r16
...
SlaveSPITransfer:
sts
USIDR,r16
ldi
r16,(1<<USIOIF)
sts
USISR,r16
SlaveSPITransfer_loop:
lds
r16, USISR
sbrs
r16, USIOIF
rjmp
SlaveSPITransfer_loop
lds
r16,USIDR
ret
The code is size optimized using only eight instructions (+ ret). The code example assumes that the DO is config-
ured as output and USCK pin is configured as input in the DDR Register. The value stored in register r16 prior to
the function is called is transferred to the master device, and when the transfer is completed the data received from
the Master is stored back into the r16 Register.
Note that the first two instructions is for initialization only and needs only to be executed once.These instructions
sets Three-wire mode and positive edge Shift Register clock. The loop is repeated until the USI Counter Overflow
Flag is set.
相關PDF資料
PDF描述
MQ83C154XXX-L16/883D 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MQ83C154CXXX-25/883R 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
MR80C154-L16/883R 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44
MQ83C154CXXX-L16P883R 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MR83C154CXXX-20P883R 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
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