122-32000 Parallax Inc, 122-32000 Datasheet - Page 226

• Manufacturer Part Number: 122-32000
• Description: MANUAL PROPELLER
• Manufacturer: Parallax Inc

Specifications of 122-32000

• Accessory Type: Manual
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

INA, INB
Input Registers for 32-bit Ports A and B.
((PUB ┆ PRI))
((PUB ┆ PRI))
Returns: Current state of I/O Pin(s) for Port A or B.
Explanation
INA
the I/O pins. The
bits 0 through 31 correspond to P0 through P31. The
for each of the 32 I/O pins in Port B; bits 0 through 31 correspond to P32 through P63.
NOTE:
so only
INA
when accessed as a source item in an expression, reads the Port A I/O pins directly at that
moment. In the result, a low (0) bit indicates the corresponding I/O pin senses ground, and a
high (1) bit indicates the corresponding I/O pin senses VDD (3.3 volts). Since the Propeller
is a CMOS device, the I/O pins sense anything above ½ VDD to be high, so a high means the
pin senses approximately 1.65 volts or higher.
Each cog has access to all I/O pins at any given time. Essentially, all I/O pins are directly
connected to each cog so that there is no hub-related mutually-exclusive access involved.
Each cog has its own
(low or high) at any time. The actual I/O pins’ values are read, regardless of their designated
input or output direction.
Page 226 · Propeller Manual v1.0
INA 〈
INB 〈
•
and
is read-only and is not really implemented as a register but rather is just an address that,
INA
INB
Pin(s)
pins, to access in Port A (0-31) or Port B (32-63). If given as a single expression,
only the pin specified is accessed. If given as a range-expression (two expressions in
a range format; x..y) the contiguous pins from the start to end expressions are
accessed.
INB
[Pin(s)]
[Pin(s)]
is discussed below.
is reserved for future use; the Propeller P8X32A does not include Port B I/O pins
are two of six registers (
is an optional expression, or a range-expression, that specifies the I/O pin, or
〉
〉
– Spin Language Reference
INA
(Reserved for future use)
register contains the current states for each of the 32 I/O pins in Port A;
INA
pseudo-register that gives it the ability to read the I/O pins states
DIRA
,
DIRB
,
INA
,
INB
INB
,
OUTA
register contains the current states
and
OUTB
) that directly affect