m38039mf-xxxsp Mitsumi Electronics, Corp., m38039mf-xxxsp Datasheet - Page 105

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

Functional Outline (serial I/O mode)
In the serial I/O mode, data is transferred synchronously with the
clock using serial input/output. The input data is read from the
SDA pin into the internal circuit synchronously with the rising edge
of the serial clock pulse; the output data is output from the SDA
pin synchronously with the falling edge of the serial clock pulse.
Data is transferred in units of eight bits.
Table 24 Software command (serial I/O mode)
Input command code 00
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 address, and then latchs it into
Fig. 95 Timings during reading
Command
Read
Program
Program verify
Erase
Erase verify
Error check
Read command
SCLK
SDA
OE
BUSY
__
Number of transfers
Note : When outputting the read data, the SDA pin is switched for output at the first falling edge of SCLK. The SDA pin is placed
“L”
Command code input (00
in the floating state during the period of th
0 0 0 0 0 0 0 0
16
in the first transfer. Proceed and input
First command
code input
C0
A0
00
40
20
80
16
16
16
16
16
16
16
t
CH
) Read address input (L)
Read address L (Input)
Program address L (Input)
Verify data (Output)
20
Verify address L (Input)
Error code (Output)
A
0
16
(Input)
(C-E)
Second
after the last rising edge of SCLK (at the 8th bit).
A
7
t
CH
Read address input (H)
A
8
In the first transfer, the user inputs the command code. This is fol-
lowed by address input and data input/output according to the
contents of the command. Table 24 shows the software com-
mands used in the serial I/O mode. The following explains each
software command.
the internal data latch. When the OE pin is released back high and
serial clock is input to the SCLK pin, the read data that has been
latched into the data latch is serially output from the SDA pin.
Read address H (Input)
Program address H (Input)
Verify address H (Input)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
A
15
—————
—————
—————
t
CR
Third
MITSUBISHI MICROCOMPUTERS
Read
t
WR
3803/3804 Group
t
RC
__
Read data (Output)
Program data (Input)
Verify data (Output)
D
Read data output
0
—————
—————
—————
Fourth
D
7
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