NEC mPD178054 Series User Manual page 55

Address Special Function Register (SFR) Name
FFD0H External access area
|
FFDFH
FFE0H Interrupt request flag register 0L
FFE1H Interrupt request flag register 0H
FFE4H Interrupt mask flag register 0L
FFE5H Interrupt mask flag register 0H
FFE8H Priority specification flag register 0L
FFE9H Priority specification flag register 0H
FFF0H Memory size switching register
FFF4H Internal expansion RAM size switching register
FFF9H Watchdog timer mode register
FFFAH Oscillation stabilization time switching register
FFFBH Processor clock control register
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:
µ PD178053
µ PD178054
µ PD178F054
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.
CHAPTER 3 CPU ARCHITECTURE
Table 3-4. Special Function Registers (3/3)
Note 1
Part Number
C6H
C8H
Value equivalent to mask ROM version
User's Manual U15104EJ2V0UD
Symbol R/W Bit Units for Manipulation After Reset
1 Bit
R/W
IF0 IF0L
IF0H
MK0 MK0L
MK0H
PR0 PR0L
PR0H
IMS —
IXS —
WDTM
OSTS —
PCC
IMS
8 Bits 16 Bits
— Undefined
00H
FFH
Note 2
— CFH
Note 3
— 0CH
— 00H
— 04H
—
55