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參數(shù)資料
| 型號： | M34238MK-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁數(shù)： | 26/41頁 |
| 文件大?。?/td> | 243K |
| 代理商： | M34238MK-XXXGP |
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MITSUBISHI MICROCOMPUTERS
4238 Group
31
FUNCTIONAL OUTLINE
In the PROM mode, data is transferred with the clock-synchronous
serial input/output. The input data is read through 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 synchro-
nously with the falling edge of the serial clock pulse. Data is trans-
ferred in units of eight bits.
Fig. 2 Timing at reading
Note. When outputting the read data, the SDA pin is switched for output at the first falling of the serial clock. The SDA pin is placed in the
high-impedance state during the th(C–E) period after the last rising edge of the serial clock (at the 16th bit).
In the first transfer, the command code is input. Then, address in-
put or data input/output is performed according to the contents of
the command code. Table 1 shows the software command used in
the PROM mode. The following explains each software command.
Number of transfer
Table 1 Software command
Command
Read
Program
Program verify
First command
code input
1516
2516
3516
Second
Read address L (input)
Program address L (input)
Third
Read address H (input)
Program address H (input)
Fourth
Read data L (output)
Program data L (input)
Number of transfer
Read
Input the command code 1516 in the first transfer. Proceed and in-
put the low-order 8 bits and the high-order 8 bits of the address and
pull the PGM pin to “L”. When this is done, the contents of input
address is read and stored into the internal data latch. When the
PGM pin is released back to “H” and serial clock is input to the SCLK
pin, the low-order 8 bits and high-order 8 bits of read data which
have been stored into the data latch, are serially output from the
SDA pin.
Command
Read
Program
Program verify
Fifth
Read data H (output)
Program data H (input)
Sixth
Verify data L (output)
Seventh
Verify data H (output)
tCR
tRC
101 0100 0
A0
A7
Command code input
(1516)
Read address input (L)
Read address input (H)
SCLK
SDA
PGM
Read
tWR
tCH
D0
D7
Read data output (L)
tCH
D8
Read data output (H)
tCH
0 000 000
A8 A9
00000 0
b0
b7
PROM VERSION OF M34238MK-XXXGP
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| M34250M2-XXXFP | 4-BIT, MROM, 4.4 MHz, MICROCONTROLLER, PDSO20 |
| M34280M1-XXXFP | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| M34280M1-XXXGP | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
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