Shiftout - Parallax BASIC Stamp 2e Programming Manual

2
2
e
Table 5.91: SHIFTOUT Quick
Facts.
5: BASIC Stamp Command Reference – SHIFTOUT

SHIFTOUT

2 2
SHIFTOUT Dpin, Cpin, Mode, [ OutputData {\Bits} {,OutputData {\Bits}...} ]
sx p
Function
Shift data out to a synchronous serial device.
• Dpin is a variable/constant/expression (0 – 15) that specifies the I/O
pin that will be connected to the synchronous serial device's data
input. This pin will be set to output mode.
• Cpin is a variable/constant/expression (0 – 15) that specifies the I/O
pin that will be connected to the synchronous serial device's clock
input. This pin will be set to output mode.
• Mode is a variable/constant/expression (0 – 1), or one of two
predefined symbols, that tells SHIFTOUT the order in which data
bits are to be arranged.
definitions.
• OutputData is a variable/constant/expression containing the data to
be sent.
• Bits is an optional variable/constant/expression (1 – 16) specifying
how many bits are to be output by SHIFTOUT. If no Bits entry is
given, SHIFTOUT defaults to 8 bits.
Quick Facts
Timing of t , t
h
t and t
a b
Transmission Rate
Explanation
SHIFTIN and SHIFTOUT provide an easy method of acquiring data from
synchronous serial devices. Synchronous serial differs from asynchronous
serial (like SERIN and SEROUT) in that the timing of data bits (on a data
line) is specified in relationship to clock pulses (on a clock line). Data bits
may be valid after the rising or falling edge of the clock line. This kind of
serial protocol is commonly used by controller peripherals like ADCs,
DACs, clocks, memory devices, etc.
BS1 BS2 BS2e BS2sx BS2p
See Table 5.92 for value and symbol
BS2
,
14 µs / 46 µs 14 µs / 46 µs
l
~16 kbits/sec ~16 kbits/sec
BASIC Stamp Programming Manual 2.0c • www.parallaxinc.com • Page 313
BS2e BS2sx
5.6 µs / 18 µs
~42 kbits/sec
BS2p
5.6 µs / 18.8 µs
~42 kbits/sec