CHAPTER 3 CPU ARCHITECTURE
67
User’s Manual U11302EJ4V0UM
Table 3-3. Special-Function Register List (3/3)
Address
Special-Function Register (SFR) Name
Symbol
R/W
Manipulatable
Bit Unit
1 Bit
8 Bits 16 Bits
FFF0H
Internal memory size switching register
IMS
R/W
–
√
–
Note
FFF4H
Internal expansion RAM size switching register
IXS
W
–
√
–
Note
FFF7H
Pull-up resistor option register
PUO
R/W
√
√
–
00H
FFF9H
Watchdog timer mode register
WDTM
√
√
–
FFFAH
Oscillation stabilization time select register
OSTS
–
√
–
04H
FFFBH
Processor clock control register
PCC
√
√
–
Note
The value after resetting the internal memory size switching register (IMS) and internal expansion RAM
size switching register (IXS) depends on the product.
µ
PD780204
µ
PD780204A
µ
PD780205
µ
PD780205A
µ
PD780206
µ
PD780208
µ
PD78P0208
IMS
C8H
CFH
CAH
CFH
CCH
CFH
CFH
IXS
None
0AH
When using the
µ
PD780204, 780205, 780206, and 780208, do not set any value other than that of IMS
and IXS after reset.
When using the
µ
PD780204A, 780205A, and 78P0208, the initial values of IMS are fixed to CFH,
regardless of the internal memory capacity. Therefore, set the values shown below for each product
before use.
µ
PD780204A: C8H
µ
PD780205A: CAH
µ
PD78P0208: Value corresponding to mask ROM version
After
Reset
Содержание mPD780204
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