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參數(shù)資料
| 型號(hào)： | M38034M4-XXXHP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 12/138頁 |
| 文件大?。?/td> | 1887K |
| 代理商： | M38034M4-XXXHP |
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Rev.4.01
Nov 14, 2003
page 107 of 136
3803/3804 Group
q Erase command
Input command code 2016 in the first transfer and command code
2016 again in the second transfer. When this is done, the 3803/
3804 group executes an erase command. Erase is initiated at the
last rising edge of the serial clock. The BUSY pin is driven high
during the erase operation. Erase is completed within 9.5 ms as
measured by the internal timer, and the BUSY pin is pulled low.
Note that data 0016 must be written to all memory locations before
executing the erase command.
Note: A erase operation is not completed by executing the erase
command once. Always be sure to execute a erase verify
command after executing the erase command. When the fail-
ure is found in the verification, the user must repeatedly ex-
ecute the erase command until the pass in the verification.
Refer to Figure 92 for the erase flowchart.
Fig. 98 Timings at erasing
q Erase verify command
The user must verify the contents of all addresses after complet-
ing the erase command. Input command code A016 in the first
transfer. Proceed and input the low-order 8 bits and the high-order
__
8 bits of the address and pull the OE pin low. When this is done,
the 3803/3804 group reads out the contents of the specified ad-
__
dress, and then latchs it into the internal data latch. When the OE
pin is released back high and serial clock is input to the SCLK pin,
the verify data that has been latched into the data latch is serially
output from the SDA pin.
Note: If any memory location where the contents have not been
erased is found in the erase verify operation, execute the op-
eration of “erase
→ erase verify” over again. In this case,
however, the user does not need to write data 0016 to memory
locations before erasing.
Fig. 99 Timings during erase verify
twE
SCLK
BUSY
OE
SDA
tCH
tEC
00000100
Command code input (2016) Command code input (2016)
Erase
“H”
“L”
SCLK
BUSY
OE
SDA
tCH
A0
A7
A8
A15
D0
D7
tCH
tCREV
Command code input (A016) Verify address input (L)
Verify address input (H)
Verify data output
tWR
Verify read
tRC
Note : When outputting the verify data, the SDA pin is switched for output at the first falling edge of SCLK. The SDA pin is placed
in the floating state during the period of th(C-E) after the last rising edge of SCLK (at the 8th bit).
00000101
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