m37753ffchp Mitsumi Electronics, Corp., m37753ffchp Datasheet - Page 20

• Manufacturer Part Number: m37753ffchp
• Description: Single Chip 16 Bit Cmos Microcomputer Flash Memory Version
• Manufacturer: Mitsumi Electronics, Corp.

___
Erase command
The erase command is executed by inputting command code 20
in the first cycle and command code 20
The command code is latched into the internal command latch at the
rising edges of the WE input in the first cycle and in the second cycle,
respectively. The erase operation is initiated at the rising edge of the
WE input in the second cycle, and the memory contents are collec-
tively erased within 9.5 ms as measured by the internal timer. Note
that data 00
ing the erase command.
Note: An erase operation is not completed by executing the erase
Fig. 11 Input/output timings during erasing (Verify data is output at the same timing as for read.)
20
command once. Always be sure to execute an erase verify
command after executing the erase command. When the fail-
ure is found in this verification, the user must repeatedly ex-
ecute the erase command until the pass. Refer to Figure 12
for the erase flowchart.
Address
CE
OE
WE
Data
V
PP
16
must be written to all memory locations before execut-
V
V
PP
PP
V
V
V
V
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
IH
IL
H
L
___
t
VSC
t
CS
t
t
RRW
WC
t
16
WP
t
DS
20
again in the second cycle.
16
t
DH
t
CH
t
WPH
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
t
CS
t
WP
t
DS
20
16
t
t
DH
CH
16
Erase
t
DE
___
Erase verify command
The user must verify the contents of all addresses after completing
the erase command. The microcomputer enters the erase verify
mode by inputting the verify address and command code A0
first cycle. The address is internally latched at the falling edge of the
WE input, and the command code is internally latched at the rising
edge of the WE input. When control signals are input in the second
cycle at the timing shown in Figure 11, the M37753FFCFP and the
M37753FFCHP output the contents of the specified address to the
external.
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
however, the user does not need to write data 00
locations before erasing.
t
AS
t
address
CS
Verify
___
t
WP
t
AH
t
DS
A0
16
t
t
DH
CH
MITSUBISHI MICROCOMPUTERS
t
WRR
erase verify” over again. In this case,
M37753FFCHP
M37753FFCFP
Erase verify
Verify data output
Dout
16
to memory
16
in the