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MB90335 Series
22.3.3
Sector Switching Register (SSR0)
The sector switching register (SSR0) specifies the sector switching between SA3 and
SA9 for operation of Dual Operation Flash.
■ Sector Switching Register (SSR0)
Figure 22.3-6 shows the configuration of the sector switching register (SSR0).
Please use byte access for write/read to the sector switching register.
SSR0
R/W : Read/Write enabled
:
Undefined
X
:
Reset value
Table 22.3-3 The Function of the Sector Switching Register (SSR0)
Bit name
bit7, bit6
Reserved: Reserved bits
bit5 to bit1
Undefined bits
SEN0:Sector switching
bit0
enable bit
CM44-10137-6E
Figure 22.3-6 The Sector Switching Register (SSR0)
bit
7
6
Address
Reserved Reserved
00790E
H
(0)
(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.
•
SEN0=0: The sector Switching is disabled. Interrupt vector is allocated to SA9.
•
SEN0=1: The sector Switching is enabled and SA3 and SA9 are switched.
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 22 DUAL OPERATION FLASH MEMORY
5
4
3
-
-
-
(X)
(X)
(X)
bit0
SEN0
Sector switching enable bit
0
Sector switching disabled
1
Sector switching enabled (between SA3 and SA9)
Function
Interrupt vector is allocated to SA3.
22.3 Registers of Flash Memory
2
1
0
-
-
SEN0
(0)
(X)
(X)
R/W
489
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