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CHAPTER 5 CPU ARCHITECTURE
IF0L
IF0H
MK0L
MK0H
PR0L
PR0H
Address Special-Function Register (SFR) Name Symbol R/W After Reset
FFD0H to
FFDFH
FFE0H Interrupt request flag register 0L √√
FFE1H Interrupt request flag register 0H √√
FFE2H Interrupt request flag register 1L IF1L √√—
FFE4H Interrupt mask flag register 0L √√
FFE5H Interrupt mask flag register 0H √√
FFE6H Interrupt mask flag register 1L MK1L √√—
FFE8H Priority order specify flag register 0L √√
FFE9H Priority order specify flag register 0H √√
FFEAH Priority order specify flag register 1L PR1L √√—
FFECH External interrupt mode register 0 INTM0 — √—
FFEDH External interrupt mode register 1 INTM1 — √—
FFF0H Memory size switching register IMS — √—Note2
FFF2H Oscillation mode selection register OSMS W — √—
FFF3H Pull-up resistor option register H PUOH R/W √√—
FFF4H Internal expansion RAM size IXS W — √— 0AH
switching register(Note3)
FFF6H Key return mode register KRM √√— 02H
FFF7H Pull-up resistor option register L PUOL √√— 00H
FFF8H Memory expansion mode register MM √√— 10H
FFF9H Watchdog timer mode register WDTM √√— 00H
FFFAH
Oscillation stabilization time select register
OSTS — √—
FFFBH Processor clock control register PCC √√ —
Table 5-6. Special-Function Register List (3/3)
Manipulatable Bit Unit
8 bits
1 bit 16 bits
External access areaNote1 √√— Undefined
R/W
IF0 √ 00H
MK0 √FFH
PR0 √
00H
00H
R/W
04H
Notes 1. The external access area cannot be accessed in SFR addressing. Access the area with direct
addressing.
2. The value after reset depends on products.
µ
PD78052, 78052Y: 44H,
µ
PD78053, 78053Y: C6H,
µ
PD78054, 78054Y: C8H,
µ
PD78P054: C8H,
µ
PD78055, 78055Y: CAH,
µ
PD78056, 78056Y: CCH,
µ
PD78058, 78058Y: CFH,
µ
PD78P058,
78P058Y: CFH
3. This register is provided only in the
µ
PD78058, 78058Y, 78P058, and 78P058Y.