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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U15104EJ2V0UD
Table 3-4. Special Function Registers (3/3)
Address
Special Function Register (SFR) Name
Symbol
R/W
Bit Units for Manipulation After Reset
1 Bit
8 Bits 16 Bits
FFD0H
External access area
Note 1
R/W
—
Undefined
|
FFDFH
FFE0H
Interrupt request flag register 0L
IF0
IF0L
00H
FFE1H
Interrupt request flag register 0H
IF0H
FFE4H
Interrupt mask flag register 0L
MK0
MK0L
FFH
FFE5H
Interrupt mask flag register 0H
MK0H
FFE8H
Priority specification flag register 0L
PR0
PR0L
FFE9H
Priority specification flag register 0H
PR0H
FFF0H
Memory size switching register
IMS
—
—
CFH
Note 2
FFF4H
Internal expansion RAM size switching register
IXS
—
—
0CH
Note 3
FFF9H
Watchdog timer mode register
WDTM
—
00H
FFFAH
Oscillation stabilization time switching register
OSTS
—
—
04H
FFFBH
Processor clock control register
PCC
—
Notes 1. The external access area cannot be accessed by means of SFR addressing. Use direct addressing to
access this area.
2. The initial value of the memory size switching register (IMS) is CFH. Set the values of these registers
of each model as follows:
Part Number
IMS
µ
PD178053
C6H
µ
PD178054
C8H
µ
PD178F054
Value equivalent to mask ROM version
3. Do not assign a value other than the initial value to the internal expansion RAM size switching register
(IXS).
Caution Do not access addresses to which no SFR is assigned.
Содержание mPD178053
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