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CHAPTER 5 CPU ARCHITECTURE
Address Special Function Register (SFR) Name Symbol R/W After Reset
FF74H Transmit shift register TXS SIO2 W — √ — FFH
Receive buffer register RXB R
FF80H A/D converter mode register ADM R/W √√— 01H
FF84H A/D converter input select register ADIS — √ — 00H
FF8AH Correction control register CORCN √√—
FF90H D/A conversion value set register 0 DACS0 — √ —
FF91H D/A conversion value set register 1 DACS1 — √ —
FF98H D/A converter mode registe DAM √√—
FFD0H to External access area
Note 1
√√— Undefined
FFDFH
FFE0H Interrupt request flag register 0L IF0 IF0L √√√00H
FFE1H Interrupt request flag register 0H IF0H √√
FFE2H Interrupt request flag register 1L IF1L √√—
FFE4H Interrupt mask flag register 0L MK0 MK0L √√√FFH
FFE5H Interrupt mask flag register 0H MK0H √√
FFE6H Interrupt mask flag register 1L MK1L √√—
FFE8H Priority order specify flag register 0L PR0 PR0L √√√
FFE9H Priority order specify flag register 0H PR0H √√
FFEAH Priority order specify flag register 1L PR1L √√—
FFECH External interrupt mode register 0 INTM0 — √ — 00H
FFEDH External interrupt mode register 1 INTM1 — √ —
FFF0H Internal memory size switching register IMS — √ — Note 2
FFF2H Oscillation mode selection register OSMS W — √ — 00H
FFF3H Pull-up resistor option register H PUOH R/W √√—
FFF4H Internal expansion RAM size IXS W — √ — 0AH
Note 3
switching register
FFF6H Key return mode register KRM R/W √√— 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 — √ — 04H
FFFBH Processor clock control register PCC √√—
Table 5-3. Special Function Register List (3/3)
8 bits
1 bit
16 bits
Notes 1. The external access area cannot be accessed in SFR addressing. Access the area through direct
addressing.
2. The value after reset depends on products.
µ
PD78076,78076Y: CCH,
µ
PD78078, 78078Y: CFH,
µ
PD78P078, 78P078Y: CFH
When a mask ROM version is used, do not set to IMS any value other than that determined at reset,
unless external device expansion function is used with the
µ
PD78078 or 78078Y.
3. When a mask ROM version is used, do not set to IXS any value other than that determined at reset.
Manipulation