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PCINT13 Datasheet(PDF) 155 Page - ATMEL Corporation

Part # PCINT13
Description  High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture
PDF  294 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

PCINT13 Datasheet(HTML) 155 Page - ATMEL Corporation

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155
9219A–RFID–01/11
Atmel ATA5505 [Preliminary]
sts
USICR,r16
lds
r16, USISR
sbrs
r16, USIOIF
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 DDRA or DDRB Register. The value
stored in register r16 prior to the function is called is transferred to the Slave device, and when
the transfer is completed 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 = fck/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



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