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參數(shù)資料
| 型號(hào)： | 38D5 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 80/141頁(yè) |
| 文件大小： | 2027K |
| 代理商： | 38D5 |
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Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 80 of 134
38D5 Group
Status Register
The status register shows the operating status of the flash
memory and whether erase operations and programs ended
successfully or in error. It can be read in the following ways:
(1) By reading an arbitrary address from the User ROM area
after writing the read status register command (70
16
)
(2) By reading an arbitrary address from the User ROM area in
the period from when the program starts or erase operation
starts to when the read array command (FF
16
) is input.
Also, the status register can be cleared by writing the clear status
register command (50
16
).
After reset, the status register is set to “80
16
”.
Table 19 shows the status register. Each bit in this register is
explained below.
Sequencer status (SR7)
The sequencer status indicates the operating status of the flash
memory. This bit is set to “0” (busy) during write or erase
operation and is set to “1” when these operations ends.
After power-on, the sequencer status is set to “1” (ready).
Erase status (SR5)
The erase status indicates the operating status of erase operation.
If an erase error occurs, it is set to “1”. When the erase status is
cleared, it is reset to “0”.
Program status (SR4)
The program status indicates the operating status of write
operation.
When a write error occurs, it is set to “1”.
The program status is reset to “0” when it is cleared.
If “1” is written for any of the SR5 and SR4 bits, the read array,
program, and block erase commands are not accepted. Before
executing these commands, execute the clear status register
command (50
16
) and clear the status register.
Also, if any commands are not correct, both SR5 and SR4 are set
to “1”.
Table 19
Definition of each bit in status register
Each bit of
SRD bits
Status name
Definition
“1”
“0”
Busy
SR7 (bit7)
SR6 (bit6)
SR5 (bit5)
SR4 (bit4)
SR3 (bit3)
SR2 (bit2)
SR1 (bit1)
SR0 (bit0)
Sequencer status
Reserved
Erase status
Program status
Reserved
Reserved
Reserved
Reserved
Ready
Terminated in error
Terminated in error
Terminated normally
Terminated normally
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