CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U19014EJ1V0UD
46
Table 3-7. Special Function Register List (4/4)
Manipulatable Bit Unit
Address Special
Function
Register (SFR) Name
Symbol
R/W
1 Bit
8 Bits
16 Bits
After
Reset
FFBDH
16-bit timer output control register 00
TOC00
R/W
√
√
−
00H
FFBEH
Low-voltage detection register
LVIM
R/W
√
√
−
00H
Note 1
FFBFH
Low-voltage detection level selection register
LVIS
R/W
√
√
−
00H
Note 1
FFE0H
Interrupt request flag register 0L
IF0L
R/W
√
√
00H
FFE1H
Interrupt request flag register 0H
IF0
IF0H R/W
√
√
√
00H
FFE2H
Interrupt request flag register 1L
IF1L
R/W
√
√
00H
FFE3H
Interrupt request flag register 1H
IF1
IF1H R/W
√
√
√
00H
FFE4H
Interrupt mask flag register 0L
MK0L R/W
√
√
FFH
FFE5H
Interrupt mask flag register 0H
MK0
MK0H R/W
√
√
√
FFH
FFE6H
Interrupt mask flag register 1L
MK1L R/W
√
√
FFH
FFE7H
Interrupt mask flag register 1H
MK1
MK1H R/W
√
√
√
FFH
FFE8H Priority
specification flag register 0L
PR0L R/W
√
√
FFH
FFE9H Priority
specification flag register 0H
PR0
PR0H R/W
√
√
√
FFH
FFEAH Priority
specification flag register 1L
PR1L R/W
√
√
FFH
FFEBH Priority
specification flag register 1H
PR1
PR1H R/W
√
√
√
FFH
FFF0H
Internal memory size switching register
Note 2
IMS
R/W
−
√
−
CFH
FFF4H
Internal expansion RAM size switching register
Note 2
IXS
R/W
−
√
−
0CH
FFFBH
Processor clock control register
PCC
R/W
√
√
−
01H
Notes 1.
The reset values of LVIM and LVIS vary depending on the reset source.
2.
Regardless of the internal memory capacity, the initial values of the internal memory size switching
register (IMS) and internal expansion RAM size switching register (IXS) are fixed (IMS = CFH, IXS = 0CH).
Therefore, be sure to set IMS to C4H and IXS to 08H.
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