UPD70433GD-16-5BB NEC [NEC], UPD70433GD-16-5BB Datasheet - Page 26

• Manufacturer Part Number: UPD70433GD-16-5BB
• Description: V55PITM 16-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

26
3.5.3
on-chip peripheral hardware operation specification, status monitoring, etc., are assigned.
active.
Note
The 496-byte space 0FFE00H to 0FFFEFH has mapped onto it a group of registers to which functions such as
Program fetches cannot be performed from these areas.
Special function register manipulation is performed by accesses by means of memory manipulation instructions.
If the special function register area is accessed, RD, WRH, WRL, IORD, IOWR and other control signals do not become
A list of special function registers is given in Table 3-5. The meaning of the items in the table is explained below.
• Symbol ............................ The symbol used to indicate the special function register name. Corresponds to the
• R/W ................................. Indicates whether this special function register is read/write enabled.
• Manipulation Method ..... Indicates which of the following can be used on the register: bit manipulation,
• RESET ............................ Indicates the status of the register after RESET input.
Special Function Register Area
Addresses which are not listed are the reserved area, therefore, they should not be accessed by the user
program.
F F F F F F H
0 F F F F F H
0 0 0 0 0 0 H
1 0 0 0 0 0 H
operand description format (symbol name) in a memory manipulation instruction.
8-bit manipulation, 16-bit manipulation, 32-bit manipulation.
R/W : Read/write enabled
R
W
Figure 3-4. Extended Memory Space
16M Bytes
: Read only
: Write only
1M Bytes
Spaecial Function
(Internal Area)
Register Area
Vector Area
0 0 3 F F H
0 0 0 0 0 H
F F F E F H
F F E 0 0 H
PD70433