M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 67

• Manufacturer Part Number: M38867E8AHP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER??
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Read-only Mode
The microcomputer enters the read-only mode by applying V
to the V
memory location to be read and the control signals at the timing
Fig. 67 Read timing
Read/Write Mode
The microcomputer enters the read/write mode by applying V
to the V
command to choose the operation (e. g., read, program, or erase)
to be performed on the flash memory (this is called the first cycle),
and then input the information necessary for execution of the com-
mand (e.g, address and data) and control signals (this is called
the second cycle). When this is done, the M38869FFAHP/GP ex-
ecutes the specified operation.
Table 21 Software command (Parallel input/output mode)
Note: ADI = Device identification address : manufacturer’s code 00000
Read
Program
Program verify
Erase
Erase verify
Reset
Device identification
DDI = Device identification data : manufacturer’s code 1C
X can be V
PP
PP
Symbol
pin. In this mode, the user must first input a software
pin. In this mode, the user can input the address of a
IL
or V
IH
.
Address
CE
OE
WE
Data
Verify address
Address input
V
V
V
V
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
OH
OL
Floating
t
WRR
First cycle
16
, device code D0
PP
16
PP
t
, device code 00001
a(AD)
t
H
Data input
L
CLZ
t
a(CE)
Valid address
t
C0
00
40
20
A0
FF
90
OLZ
t
a(OE)
16
16
16
16
16
16
16
t
RC
shown in Figure 67, and the M38869FFAHP/GP will output the
contents of the user’s specified address from data I/O pin to the
external. In this mode, the user cannot perform any operation
other than read.
Table 21 shows the software commands and the input/output in-
formation in the first and the second cycles. The input address is
latched internally at the falling edge of the WE input; software
commands and other input data are latched internally at the rising
edge of the WE input.
The following explains each software command. Refer to Figures 68
to 70 for details about the signal input/output timings.
16
16
Dout
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
___
Program address
t
Read address
Address input
DH
t
DF
MITSUBISHI MICROCOMPUTERS
ADI
Floating
Second cycle
3886 Group
Program data (Input)
Read data (Output)
Verify data (Output)
Verify data (Output)
___
DDI (Output)
FF
20
Data I/O
16
16
(Input)
(Input)
67