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Operating Modes
Table 4-1. DSP56311 Operating Modes (Continued)
Mode
A
MODD
1
MODC
0
MODB
1
MODA
0
Reset
Vector
$FF0000
Description
Bootstrap through SCI
Instructions are loaded through the SCI. The
bootstrap program sets the SCI to operate in 10-bit
asynchronous mode, with 1 start bit, 8 data bits, 1
stop bit, and no parity. Data is received in this order:
start bit, 8 data bits (LSB first), and one stop bit. Data
is aligned in the SCI receive data register with the
LSB of the least significant byte of the received data
appearing at Bit 0.The user must provide an external
clock source with a frequency at least 16 times the
transmission data rate. Each byte received by the
SCI is echoed back through the SCI transmitter to
the external transmitter. The boot program
concatenates every 3 bytes read from the SCI into a
24-bit wide DSP56311 word.
B
C
1
1
0
1
1
0
1
0
$FF0000
$FF0000
Reserved
HI08 bootstrap in ISA/DSP563xx mode
The HI08 is configured to interface with an ISA bus
or with the memory expansion port of a master
DSP563xx processor through the HI08. The HI08 pin
configuration is optimized for connection to the ISA
bus or memory expansion port of a master DSP
based on the DSP56300 core.
D
1
1
0
1
$FF0000
HI08 bootstrap in HC11 nonmultiplexed mode
The bootstrap program sets the host interface to
interface with the Motorola HC11 microcontroller
through the HI08. The HI08 pin configuration is
optimized for connection to the Motorola HC11
nonmultiplexed bus.
E
1
1
1
0
$FF0000
HI08 bootstrap in 8051 multiplexed bus mode
The bootstrap program sets the host interface to
interface with the Intel 8051 bus through the HI08.
The program stored in this location, after testing
MODA, MODB, MODC, and MODD, bootstraps
through HI08. The HI08 pin configuration is
optimized for connection to the Intel 8051
multiplexed bus.
F
1
1
1
1
$FF0000
HI08 bootstrap in MC68302 bus mode
The bootstrap program sets the host interface to
interface with the Motorola MC68302 or MC68360
bus through the HI08. The HI08 pin configuration is
optimized for connection to a Motorola MC68302 or
MC68360 bus.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
4-3
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