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參數(shù)資料
| 型號： | M37274MA |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機) |
| 中文描述： | 單芯片8位單片機（8位單片機） |
| 文件頁數(shù)： | 24/131頁 |
| 文件大?。?/td> | 2049K |
| 代理商： | M37274MA |
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24
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
Fig. 16. Serial I/O Mode Register
Internal clock : The serial I/O counter is set to “7” during the write
cycle into the serial I/O register (address 0214
16
), and the transfer
clock goes “H” forcibly. At each falling edge of the transfer clock after
the write cycle, serial data is output from the S
OUT
pin. Transfer di-
rection can be selected by bit 5 of the serial I/O mode register. At
each rising edge of the transfer clock, data is input from the S
IN
pin
and data in the serial I/O register is shifted 1 bit.
After the transfer clock has counted 8 times, the serial I/O counter
becomes “0” and the transfer clock stops at HIGH. At this time the
interrupt request bit is set to “1.”
External clock : The an external clock is selected as the clock source,
the interrupt request is set to “1” after the transfer clock has been
counted 8 counts. However, transfer operation does not stop, so the
clock should be controlled externally. Use the external clock of 500kHz
or less with a duty cycle of 50%.
The serial I/O timing is shown in Figure 15. When using an external
clock for transfer, the external clock must be held at HIGH for initial-
izing the serial I/O counter. When switching between an internal clock
and an external clock, do not switch during transfer. Also, be sure to
initialize the serial I/O counter after switching.
Notes 1:
On programming, note that the serial I/O counter is set by
writing to the serial I/O register with the bit managing in-
structions, such as SEB and CLB.
2:
When an external clock is used as the synchronous clock,
write transmit data to the serial I/O register when the trans-
fer clock input level is HIGH.
Fig. 15. Serial I/O Timing (for LSB first)
Synchronous clock
Transfer clock
Serial I/O register
write signal
Serial I/O output
S
OUT
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
(Note)
Serial I/O input
S
IN
Note :
When an internal clock is selected, the S
OUT
pin is at high-impedance after transfer is completed.
Interrupt request bit is set to “1”
7
Serial I/O mode register
(SM : address 0213
16
)
Internal synchronous clock
selection bits
b1 b0
0 0 : f(X
IN
)/8 or f(X
CIN
)/8
0 1 : f(X
IN
)/16 or f(X
CIN
)/16
1 0 : f(X
IN
)/32 or f(X
CIN
)/32
1 1 : f(X
IN
)/64 or f(X
CIN
)/64
0
0
Synchronous clock selection bit
0 : External clock
1 : Internal clock
Port function selection bit
0 : P1
1
, P1
3
functions as port
1 : SCL1, SDA1
Port function selection bit
0 : P1
2
, P1
4
functions as port
1 : SCL2, SDA2
Transfer direction selection bit
0 : LSB first
1 : MSB first
Fix these bits to “0”
0
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| M37274MA-052SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37274MA-053SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37274MA-082SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37274MA-084SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37274MA-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
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