UPD70433GJ-16-3EB データシートの表示（PDF） - NEC => Renesas Technology

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UPD70433GJ-16-3EB

V55PI™ 16-BIT MICROPROCESSOR

NEC => Renesas Technology 

µPD70433

Figure 3-4. Extended Memory Space

000000H

Vector Area

00000H

003FFH

1M Bytes

0FFFFFH

100000H

16M Bytes

Spaecial Function

Register Area

(Internal Area)

FFE00H

FFFEFH

FFFFFFH

3.5.3 Special Function Register Area

The 496-byte space 0FFE00H to 0FFFEFH has mapped onto it a group of registers to which functions such as

on-chip peripheral hardware operation specification, status monitoring, etc., are assigned.

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

active.

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

operand description format (symbol name) in a memory manipulation instruction.

• R/W ................................. Indicates whether this special function register is read/write enabled.

R/W : Read/write enabled

R : Read only

W : Write only

• Manipulation Method ..... Indicates which of the following can be used on the register: bit manipulation,

8-bit manipulation, 16-bit manipulation, 32-bit manipulation.

• RESET ............................ Indicates the status of the register after RESET input.

Note Addresses which are not listed are the reserved area, therefore, they should not be accessed by the user

program.

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