McASP Registers
www.ti.com
22.4.1.5 Pin Data Output Register (PDOUT)
The pin data output register (PDOUT) holds a value for data out at all times, and may be read back at all
times. The value held by PDOUT is not affected by writing to PDIR and PFUNC. However, the data value
in PDOUT is driven out onto the McASP pin only if the corresponding bit in PFUNC is set to 1 (GPIO
function) and the corresponding bit in PDIR is set to 1 (output). When reading data, returns the
corresponding bit value in PDOUT[n], does not return input from I/O pin; when writing data, writes to the
corresponding PDOUT[n] bit. The PDOUT is shown in Figure 22-43 and described in Table 22-16.
PDOUT has these aliases or alternate addresses:
• PDSET - when written to at this address, writing a 1 to a bit in PDSET sets the corresponding bit in
PDOUT to 1; writing a 0 has no effect and keeps the bits in PDOUT unchanged.
• PDCLR - when written to at this address, writing a 1 to a bit in PDCLR clears the corresponding bit in
PDOUT to 0; writing a 0 has no effect and keeps the bits in PDOUT unchanged.
There is only one set of data out bits, PDOUT[31-0]. The other registers, PDSET and PDCLR, are just
different addresses for the same control bits, with different behaviors during writes.
CAUTION
Writing to Reserved Bits
Writing a value other than 0 to reserved bits in this register may cause improper
device operation.
Figure 22-43. Pin Data Output Register (PDOUT)
31 30 29 28 27 26 25 24
AFSR AHCLKR ACLKR AFSX AHCLKX ACLKX AMUTE Reserved
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0
23 8
Reserved
R-0
7 6 5 4 3 2 1 0
Reserved AXR5 AXR4 AXR3 AXR2 AXR1 AXR0
R-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
3834
Multichannel Audio Serial Port (McASP) SPRUH73H–October 2011–Revised April 2013
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated
To Next Page
Loading...
Need help?
General
