ATMEGA16-16AU SL602 Atmel, ATMEGA16-16AU SL602 Datasheet - Page 142
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ATMEGA16-16AU SL602
Manufacturer Part Number
ATMEGA16-16AU SL602
Description
Manufacturer
Atmel
Datasheet
1.ATMEGA16-16AU_SL602.pdf
(357 pages)
- Current page: 142 of 357
- Download datasheet (8Mb)
SPI Status Register –
SPSR
SPI Data Register –
SPDR
2466T–AVR–07/10
• Bit 7 – SPIF: SPI Interrupt Flag
When a serial transfer is complete, the SPIF Flag is set. An interrupt is generated if SPIE in
SPCR is set and global interrupts are enabled. If SS is an input and is driven low when the SPI is
in Master mode, this will also set the SPIF Flag. SPIF is cleared by hardware when executing the
corresponding interrupt handling vector. Alternatively, the SPIF bit is cleared by first reading the
SPI Status Register with SPIF set, then accessing the SPI Data Register (SPDR).
• Bit 6 – WCOL: Write COLlision Flag
The WCOL bit is set if the SPI Data Register (SPDR) is written during a data transfer. The
WCOL bit (and the SPIF bit) are cleared by first reading the SPI Status Register with WCOL set,
and then accessing the SPI Data Register.
• Bit 5..1 – Res: Reserved Bits
These bits are reserved bits in the ATmega16 and will always read as zero.
• Bit 0 – SPI2X: Double SPI Speed Bit
When this bit is written logic one the SPI speed (SCK Frequency) will be doubled when the SPI
is in Master mode (see
clock periods. When the SPI is configured as Slave, the SPI is only guaranteed to work at f
or lower.
The SPI interface on the ATmega16 is also used for program memory and EEPROM download-
ing or uploading. See
The SPI Data Register is a read/write register used for data transfer between the Register File
and the SPI Shift Register. Writing to the register initiates data transmission. Reading the regis-
ter causes the Shift Register Receive buffer to be read.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
SPIF
MSB
R/W
R
X
7
0
7
page 273
WCOL
R/W
R
6
0
6
X
Table
58). This means that the minimum SCK period will be two CPU
R/W
for SPI Serial Programming and Verification.
R
5
–
0
5
X
R/W
4
–
R
0
4
X
R/W
R
X
3
–
0
3
R/W
R
X
2
–
0
2
R/W
R
1
–
0
1
X
ATmega16(L)
SPI2X
R/W
LSB
R/W
0
0
0
X
Undefined
SPSR
SPDR
osc
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