參數(shù)資料
型號(hào)： M37281MAH-XXXSP
廠商： Renesas Technology Corp.
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)： 31/172頁(yè)
文件大?。?/td> 1319K
代理商： M37281MAH-XXXSP
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Rev.1.01 2003.07.16 page 31 of 170
M37281MAH
–
XXXSP,M37281MFH
–
XXXSP,M37281MKH
–
XXXSP, M37281EKSP
Fig. 8.5.2 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
”
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
500 kHz or less with a duty cycle of 50 %.
The serial I/O timing is shown in Figure 8.5.2. When using an exter-
nal clock for transfer, the external clock must be held at HIGH for
initializing the serial I/O counter. When switching between an inter-
nal 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 instructions, such as SEB
and CLB.
2:
When an external clock is used as the synchronous clock, write trans-
mit data to the serial I/O register when the transfer clock input level is
HIGH.
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