m38039mf-xxxsp Mitsumi Electronics, Corp., m38039mf-xxxsp Datasheet - Page 107

• Manufacturer Part Number: m38039mf-xxxsp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Mitsumi Electronics, Corp.

Input command code 20
20
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 00
Fig. 98 Timings at erasing
The user must verify the contents of all addresses after complet-
ing the erase command. Input command code A0
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,
Fig. 99 Timings during erase verify
Erase command
Erase verify command
16
again in the second transfer. When this is done, the 3803/
SCLK
SDA
OE
BUSY
SCLK
SDA
OE
BUSY
“H”
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
“L”
Command code input (20
16
Command code input (A0
must be written to all memory locations before
in the floating state during the period of th
0 0 0 0 0 1 0 0
0 0 0 0 0 1 0 1
16
in the first transfer and command code
__
16
t
) Command code input (20
CH
16
t
CH
) Verify address input (L)
0 0 0 0 0 1 0 0
A
0
16
in the first
(C-E)
after the last rising edge of SCLK (at the 8th bit).
A
7
__
16
t
)
CH
Verify address input (H)
A
8
executing the erase command.
Note: A erase operation is not completed by executing the erase
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
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.
erased is found in the erase verify operation, execute the op-
eration of “erase
however, the user does not need to write data 00
locations before erasing.
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
A
15
t
CREV
Erase
tw
E
Verify read
MITSUBISHI MICROCOMPUTERS
t
WR
erase verify” over again. In this case,
3803/3804 Group
t
RC
D
Verify data output
0
D
16
7
t
EC
to memory
107