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CHAPTER 3
CPU ARCHITECTURE
User’s Manual U12790EJ2V0UD
Table 3-4. Special-Function Registers (1/4)
Address
Special-Function Register (SFR) Name
Symbol
R/W
Manipulatable Bits
After Reset
18
16
FF00H
Port 0
P0
R/W
—
00H
FF01H
Port 1
P1
R
—
Undefined
FF02H
Port 2
P2
R/W
—
00H
FF03H
Port 3
P3
—
FF04H
Port 4
P4
—
FF05H
Port 5
P5
—
FF06H
Port 6
P6
—
FF07H
Port 7
P7
—
FF0AH
Port 10
P10
—
FF0CH
Port 12
P12
—
FF0DH
Port 13
P13
—
FF10H
A/D conversion result register 3Note 1
ADCR3
————
—
FF11H
R—
—
Undefined
FF12H
A/D converter mode register 3
ADM3
R/W
—
00H
FF13H
Analog input channel specification register 3
ADS3
—
FF15H
Power-fail comparison threshold value register 3
PFT3
—
FF16H
Power-fail comparison mode register 3
PFM3
—
FF19H
VM45 control register
VM45C
—
FF1AH
Serial I/O shift register 0
SIO0
—
Undefined
FF1BH
POC status register
POCS
R&Reset
—
HeldNote 2
FF20H
Port mode register 0
PM0
R/W
—
FFH
FF22H
Port mode register 2
PM2
—
FF23H
Port mode register 3
PM3
—
FF24H
Port mode register 4
PM4
—
FF25H
Port mode register 5
PM5
—
FF26H
Port mode register 6
PM6
—
FF27H
Port mode register 7
PM7
—
FF2AH
Port mode register 10
PM10
—
FF2CH
Port mode register 12
PM12
—
FF40H
Clock output select register
CKS
—
00H
FF41H
BEEP frequency select register 0
BEEPCL0
—
FF42H
Watchdog timer clock select register
WDCS
—
FF43H
Serial interface clock select register 0
SCL0
—
08H
FF48H
External interrupt rising edge enable register
EGP
—
00H
FF49H
External interrupt falling edge enable register
EGN
—
Notes 1. This register can be accessed only in 8-bit units. When ADCR3 is read, the value of FF11H is read.
2. The value of this register is 03H only after reset by power-on clear. This register is not reset by the RESET
pin or watchdog timer.
Caution Do not access addresses to which no SFR is assigned.