參數(shù)資料
型號: MR80C52TXXX-30SBD
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44
封裝: LCC-44
文件頁數(shù): 21/141頁
文件大?。?/td> 7628K
代理商: MR80C52TXXX-30SBD
201
8021G–AVR–03/11
ATmega329P/3290P
rjmp
SPITransfer_loop
lds
r16,USIDR
ret
The code is size optimized using only eight instructions (+ ret). The code example assumes that
the DO and USCK pins are enabled as output in the DDRE Register. The value stored in register
r16 prior to the function is called is transferred to the Slave device, and when the transfer is com-
pleted the data received from the Slave is stored back into the r16 Register.
The second and third instructions clears the USI Counter Overflow Flag and the USI counter
value. The fourth and fifth instruction set Three-wire mode, positive edge Shift Register clock,
count at USITC strobe, and toggle USCK. The loop is repeated 16 times.
The following code demonstrates how to use the USI module as a SPI Master with maximum
speed (fsck = f
ck/4):
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
相關PDF資料
PDF描述
MQ80C52EXXX-36/883D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
MD83C154CXXX-16P883D 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
MR83C154CXXX-25P883R 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
MR83C154XXX-25/883D 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
MD80C32E-16/883 8-BIT, 16 MHz, MICROCONTROLLER, CDIP40
相關代理商/技術(shù)參數(shù)
參數(shù)描述
MR80C86 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor
MR80C86/B 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC
MR80C86-2 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor
MR80C86-2/883 制造商:Rochester Electronics LLC 功能描述:- Bulk
MR80C86-2/B 制造商:Intersil Corporation 功能描述:MPU 80C86 16BIT CMOS 8MHZ 44PLCC - Rail/Tube