NEC mPD780208 Subseries User Manual page 67

Address Special-Function Register (SFR) Name
FFF0H Internal memory size switching register
FFF4H Internal expansion RAM size switching register
FFF7H Pull-up resistor option register
FFF9H Watchdog timer mode register
FFFAH Oscillation stabilization time select register
FFFBH Processor clock control register
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
IMS C8H CFH
IXS None
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
CHAPTER 3 CPU ARCHITECTURE
Table 3-3. Special-Function Register List (3/3)
µ PD780205 µ PD780205A
CAH CFH
User's Manual U11302EJ4V0UM
Symbol R/W Manipulatable
Bit Unit
1 Bit
IMS R/W –
IXS W –
√
PUO R/W
√
WDTM
OSTS –
√
PCC
µ PD780206 µ PD780208
CCH CFH
0AH
After
Reset
8 Bits 16 Bits
√
Note
–
√
Note
–
√
– 00H
√
–
√
– 04H
√
–
µ PD78P0208
CFH
67