1. Yes, any higher-order address lines that are not used by the external|
peripheral and/or your address decoding can be used as GPIO inputs or outputs.
Just set the bits in the Peripheral Enable Register (PER) for the pins you want
to use, this is described in Chapter 7 "General Purpose Input/Output (GPIO)" in
the DSP56F80x User's Manual.
2. Yes, you can set the BOOTMAP_B bit (Bit 4) in the System Control Register
(SYS_CNTL), this is described in Section 16.7.1 "System Control Register
(SYS_CNTL)" in the DSP56F80x User's Manual.
Senior Systems Analyst
PMC Prime Mover Controls Inc.
3600 Gilmore Way
Burnaby, B.C., Canada
Phone: 604 433-4644
FAX: 604 433-5570
From: Roger Flor [mailto:]
Sent: Sunday, October 06, 2002 6:53 PM
Subject: [motoroladsp] Port A on the DSP56F80x
I am using a DSP56F805.
1. If I write data to a peripheral(say an LCD controller) using the external
data bus, will I be able to override the address bus and use some of the
multiplexed GPIO's(GPIOE2, GPIOE3, and GPIOA0 to GPIOA7)?
2. Upon exit from RESET, if I use operating mode MODE 0A by tying the
EXTBOOT pin to ground, will I be able to shift to operating mode MODE 0B
after booting up?
Thanks a lot.
Note: If you do a simple "reply" with your email client, only the author of this
message will receive your answer. You need to do a "reply all" if you want your
answer to be distributed to the entire group.
About this discussion group:
More Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/