參數(shù)資料
型號(hào)： M38195M1-XXXFP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 29/60頁(yè)
文件大?。?/td> 664K
代理商： M38195M1-XXXFP
29
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Table GA-2. P6
7
/S
RDY1
/CS selection
(2.4) When Selecting the External Clock
When selecting the external clock, the internal clock and the set-
ting of transfer interval with the serial I/O automatic transfer
interval register are invalid, but the serial I/O output pin S
OUT1
and
the internal transfer clock can be controlled from the outside by
setting the S
RDY1
pin to the CS (input) pin.
When the CS input is “L”, the S
OUT1
pin and the internal transfer
clock are enabled.
When the CS input is “H”, the S
OUT1
pin goes to high impedance
state and the internal transfer clock goes to “H”.
Select the function of the P6
7
/S
RDY1
/CS/S
CLK12
with the following
registers (refer to Table GA-2):
G
the bit 4 (SC1
4
) and the bit 6 (SC1
6
) of the serial I/O1 control
register
G
the bit 0 (SIOAC
0
) of the serial I/O automatic transfer control
register
Switch the CS pin from “L” to “H” or from “H” to “L” during “H” of the
transfer clock (S
CLK11
input) after transferring 1-byte data.
When selecting the external clock, set the external clock to “L” af-
ter 9 cycles or more of the internal clock
φ
after setting the start
bit. After transferring 1-byte data, leave 11 cycles or more of the
internal clock
φ
free for the transfer interval.
When not using the CS input, note that the S
OUT
pin will not go to
high impedance state, even after transfer is completed.
When not using the CS input, or when CS is “L”, control the exter-
nal clock because the data in the serial I/O register will continue to
shift while the external clock is input, even after the completion of
automatic transfer (Note that the automatic transfer interrupt re-
quest bit is set and the bit 1 of the serial I/O automatic transfer
register is cleared at the point when the specified number of bytes
of data have been transferred.)
SC1
6
0
SC1
4
0
1
SIOAC
0
0
1
P6
7
/S
RDY1
/CS
P6
7
S
RDY1
CS
Note :
SC1
4
: S
RDY1
output selection bit
SC1
6
: Synchronous clock selection bit
SIOAC
0
: Automatic transfer control bit
Fig. GA-10 Timing during serial I/O automatic transfer (external clock selected)
X
Bit 1 write signal of serial I/O
automatic transfer control
register
Serial I/O output
S
OUT
Serial I/O input
S
IN
Note:
Data marked with X is invalid.
Bit 1 of serial I/O automatic
transfer control register
Write signal from RAM to
serial I/O1 register
Write signal from serial I/O1
register to RAM
Transfer clock
(internal)
Data pointer
CS
n-1
n
DO
0
X
Transfer clock
S
CLK
input
External input
X
DO
1
DO
2
DO
3
DO
4
DO
5
DO
6
DO
7
DI
0
DI
1
DI
2
DI
3
DI
4
DI
5
DI
6
DI
7
X
X
X
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