mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 102

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

5
5.2 CPU32 Registers
5-2
The CPU32 programming model consists of two groups of registers that correspond
to the user and supervisor privilege levels. User programs can use only the registers
of the user model. The supervisor programming model, which supplements the user
programming model, is used by CPU32 system programmers who wish to protect sen-
sitive operating system functions. The supervisor model is identical to that of the
MC68010 and later processors.
The CPU32 has eight 32-bit data registers, seven 32-bit address registers, a 32-bit
program counter, separate 32-bit supervisor and user stack pointers, a 16-bit status
register, two alternate function code registers, and a 32-bit vector base register (see
Figure 5-2 and Figure 5-3).
MICROSEQUENCER AND CONTROL
CONTROL STORE
CONTROL LOGIC
Freescale Semiconductor, Inc.
ADDRESS
For More Information On This Product,
Figure 5-1 CPU32 Block Diagram
BUS
CENTRAL PROCESSING UNIT
Go to: www.freescale.com
WRITE PENDING
STAGE
C
PROGRAM
COUNTER
SECTION
BUFFER
DECODE
INSTRUCTION PIPELINE
EXECUTION UNIT
BUS CONTROL
CONTROLLER
MICROBUS
SIGNALS
STAGE
B
CONTROLLER
PREFETCH
SECTION
DATA
BUFFER
STAGE
A
USER’S MANUAL
DATA
BUS
MC68331
1127A