dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 80

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

All of the PCU registers are read/write to facilitate system debugging. Although none of
the registers are 24 bits, they are read or written over 24-bit buses. When they are read,
the least significant bits (LSBs) are significant, and the most significant bits (MSBs) are
zeroed as appropriate. When they are written, only the appropriate LSBs are significant,
and the MSBs are written as don’t care.
5 - 4
56K Mod-
GENERATOR
INTERNAL
24-Bit
SWITCH
CLOCK
PLL
DATA
BUS
PERIPHERAL
MODULES
CONTROLLER
INTERRUPT
PROGRAM
GENERATION
Freescale Semiconductor, Inc.
MODC/NMI
MODB/IRQB
MODA/IRQA
RESET
ADDRESS
Figure 5-2 DSP56K Block Diagram
For More Information On This Product,
CONTROLLER
UNIT
PROGRAM
DECODE
Program Control Unit
PROGRAM CONTROL UNIT
Go to: www.freescale.com
EXPANSION
GENERA TOR
PROGRAM
RAM/ROM
PROGRAM
ADDRESS
OVERVIEW
YAB
XAB
PAB
YDB
XDB
PDB
GDB
TWO 56-BIT ACCUMULATORS
EXPANSION
X MEMORY
24X24 + 56 56-BIT MAC
RAM/ROM
DATA ALU
EXPANSION
Y MEMORY
RAM/ROM
EXPANSION
EXTERNAL
EXTERNAL
ADDRESS
DATA BUS
CONTROL
SWITCH
SWITCH
OnCE™
BUS
BUS
16 BITS
24 BITS
AREA
MOTOROLA