Special Areas - Fujitsu Semiconductor Controller MB89950/950A Hardware Manual

CHAPTER 3 CPU
3.1.1

Special Areas

In addition to the I/O area, the special purpose areas in the memory space include the
general-purpose register area and the vector table area.
I General-purpose register areas (addresses: 0100
• Provides auxiliary registers for 8-bit arithmetic operation and transfer instructions.
• Allocated to a region of the RAM area. Can also be used as normal RAM.
• Using the area as general-purpose registers enables high-speed access by general-purpose register
addressing using short instructions.
Table 3.1-1 "General-purpose register areas" lists the areas in each device that can be used for general-
purpose registers.
Table 3.1-1 General-purpose register areas
Part number
Number of banks
Address range
See section 3.2.2 "Register Bank Pointer (RP)" and section 3.3 "General-purpose Registers" for details.
24
to 01FF
H
MB89951A
8
0100 to 013F 0100
H H
)
H
MB89953A MB89P955/PV950
16
to 017F 0100
H H
32
to 01FF
H H