PIC16F88-I/ML【PDF 27/200 页】IC MCU FLASH 4KX14 EEPROM 28QFN

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122

8008H–AVR–04/11

ATtiny48/88

When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is overridden

according to Table 14-1 on page 122. For more details on automatic port overrides, refer to

“Alternate Port Functions” on page 65.

Note:

1. See “Alternate Functions of Port B” on page 69 for a detailed description of how to define the

direction of the user defined SPI pins.

The following code examples show how to initialize the SPI as a Master and how to perform a

simple transmission. DDR_SPI in the examples must be replaced by the actual Data Direction

actual data direction bits for these pins. E.g. if MOSI is placed on pin PB5, replace DD_MOSI

with DDB5 and DDR_SPI with DDRB.

Note:

1. See ”About Code Examples” on page 7.

Table 14-1.

SPI Pin Overrides

(1)

Pin

Direction, Master SPI

Direction, Slave SPI

MOSI

User Defined

Input

MISO

Input

User Defined

SCK

User Defined

Input

User Defined

Input

Assembly Code Example

(1)

SPI_MasterInit:

; Set MOSI and SCK output, all others input

ldi

r17,(1<<DD_MOSI)|(1<<DD_SCK)

out

DDR_SPI,r17

; Enable SPI, Master, set clock rate fck/16

ldi

r17,(1<<SPE)|(1<<MSTR)|(1<<SPR0)

out

SPCR,r17

ret

SPI_MasterTransmit:

; Start transmission of data (r16)

out

SPDR,r16

Wait_Transmit:

; Wait for transmission complete

sbis

SPSR,SPIF

rjmp

Wait_Transmit

ret

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