Basic Micro Studio Syntax Manual

SHIFTOUT
Syntax
shiftout dpin,cpin,mode,[OutputData1{\bits}, ..., OutputDataN{\bits}]
Commands
• Dpin - is a variable, constant or expression that specifi es the data input pin. This pin will switch
to an input pin.
• Cpin - is a variable, constant or expression that specifi es the clock output pin. This pin will switch
to an output.
• Mode - is a value (0 to 7) or a predefi ned constant that sets the incoming data conditions.
• OutputData - is a variable, constant or expression that specifi es the data to be sent. The only
limit to the amount of data is the available ram on the processor being used.
• Bits - is an optional entry (1 – 32) defi ning the number of bits that will be sent.
Supported
• BA - Supported
• BAN - Supported
• BAP - Supported
• BAP40 - Supported
Description
The SHIFTIN and SHIFTOUT commands can send or received data from synchronous serial
devices like an SPI device. Synchronous serial differs from asynchronous serial (SERIN / SEROUT)
in that there is a clock line. This clock line is used to time the data bits sent or received. There are
several settings which make the SHIFTIN / SHIFTOUT commands fl exible enough to work with most
synchronous serial devices.
The following tables provide all supported modes and maximum speed in kilo bits per second that
each processor family can handle. There are 8 modes. The fi rst 4 modes (0-3) are standard modes.
The second set of 4 modes (4-7) are basically duplicates of the fi rst 4 modes but for high speed
operation.
Modes
Mode Value Description
MSBPRE 0 Sample bits msb fi rst, before clock pulse
LSBPRE 1 Sample bits lsb fi rst, before clock pulse
MSBPOST 2 Sample bits msb fi rst, after clock pulse
LSBPOST 3 Sample bits lsb fi rst, after a clock pulse
FASTMSBPRE 4 Faster sampling, msb fi rst, before clock pulse
FASTLSBPRE 5 Faster sampling, lsb fi rst, before clock pulse
FASTMSBPOST 6 Faster sampling, msb fi rst, after clock pulse
FASTLSBPOST 7 Faster sampling, lsb fi rst, after clock pulse
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