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20.2
Register for Dual Operation Flash
The following register is used for operation of Dual Operation Flash:
• Sector switching register (SSR0)
I Sector switching register (SSR0)
Figure 20.2-1 shows the configuration of the sector switching register (SSR0).
Please use byte access for write/read to the sector switching register.
Figure 20.2-1 The configuration of the sector switching register (SSR0)
SSR0
R/W : Read/Write enabled
Table 20.2-1 the function of the sector switching register (SSR0)
Bit name
Bit7, Bit6
Reserved: Reserved bit
Bit5- Bit1
Undefined bit
Bit0
SEN0:
bit
7
[390C
]
Reserved Reserved
H
(0)
R/W
R/W
Be sure to set to "0".
At a read: The value is undefined.
At a write: The operation is not affected.
The SEN0 bit switches access from the CPU for reprogramming
the upper bank from SA9 containing the interrupt vector to SA3 in
the lower bank.
CHAPTER 20 DUAL OPERATION FLASH
6
5
4
3
-
-
-
(0)
(X)
(X)
(X)
Function
SEN0
0
Interrupt vector to SA9
1
Interrupt vector to SA3
2
1
0
-
-
SEN0
(X)
(X)
(0)
R/W
Function
Initial value
(
)
611
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