參數(shù)資料
型號(hào)： M37274MA-082SP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
中文描述： 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器
文件頁(yè)數(shù)： 26/147頁(yè)
文件大小： 2042K
代理商： M37274MA-082SP
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26
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
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.”
Fig. 20. 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”
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 20. 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.
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