CHAPTER 3 CPU ARCHITECTURE
User’s Manual U17446EJ3V1UD
37
Table 3-3. Special Function Registers (1/3)
Number of Bits Manipulated
Simultaneously
Address
Special Function Register (SFR) Name
Symbol
R/W
1 Bit
8 Bits
16 Bits
After Reset
FF00H
Port register 0
P0
√
√
−
FF02H
Port register 2
P2
√
√
−
FF03H
Port register 3
P3
√
√
−
FF04H
Port register 4
P4
√
√
−
FF0CH
Port register 12
P12
√
√
−
FF0DH
Port register 13
P13
R/W
Note 1
√
√
−
FF0EH
8-bit timer H compare register 01
CMP01
−
√
−
FF0FH
8-bit timer H compare register 11
CMP11
R/W
−
√
−
00H
FF10H
16-bit multiplication result storage register L
MUL0L
−
√
FF11H
16-bit multiplication result storage register H MUL0H
MUL0
−
√
√
Undefined
FF12H
FF13H
16-bit timer counter 00
TM00
R
−
−
√
Note 2
0000H
FF14H
FF15H
16-bit timer capture/compare register 000
CR000
−
−
√
Note 2
0000H
FF16H
FF17H
16-bit timer capture/compare register 010
CR010
R/W
−
−
√
Note 2
0000H
FF18H
FF19H
10-bit A/D conversion result register
ADCR
−
−
√
Note 2
FF1AH
8-bit A/D conversion result register
ADCRH
R
−
√
−
Undefined
FF20H
Port mode register 0
PM0
√
√
−
FF22H
Port mode register 2
PM2
√
√
−
FF23H
Port mode register 3
PM3
√
√
−
FF24H
Port mode register 4
PM4
√
√
−
FF2CH
Port mode register 12
PM12
√
√
−
FFH
FF30H
Pull-up resistor option register 0
PU0
√
√
−
FF32H
Pull-up resistor option register 2
PU2
√
√
−
FF33H
Pull-up resistor option register 3
PU3
√
√
−
FF34H
Pull-up resistor option register 4
PU4
√
√
−
FF3CH
Pull-up resistor option register 12
PU12
√
√
−
00H
FF48H
Watchdog timer mode register
WDTM
−
√
−
67H
FF49H
Watchdog timer enable register
WDTE
−
√
−
9AH
FF50H
Low-voltage detect register
LVIM
√
√
−
FF51H
Low-voltage detection level select register
LVIS
R/W
−
√
−
00H
Note 3
FF54H
Reset control flag register
RESF
R
−
√
−
00H
Note 4
FF58H
Low-speed internal oscillation mode register LSRCM
R/W
√
√
−
00H
Notes 1.
Only P34 is an input-only port.
2.
A 16-bit access is possible only by the short direct addressing.
3.
Retained only after a reset by LVI.
4.
Varies depending on the reset cause.