參數(shù)資料
型號(hào)： M38B40M3H-XXXXFP
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)
文件頁數(shù)： 30/78頁
文件大?。?/td> 1214K
代理商： M38B40M3H-XXXXFP
30
38B4 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
G
Serial I/O1 operation
Either the internal synchronous clock or external synchronous clock
can be selected by the serial I/O1 synchronous clock selection bits
(b2 and b3 of address 0019
16
) of serial I/O1 control register 1 as
synchronous clock for serial transfer.
The internal synchronous clock has a built-in dedicated divider where
7 different clocks are selected by the internal synchronous clock
selection bits (b5, b6 and b7 of address 001C
16
) of serial I/O1
control register 3.
The P6
2
/S
RDY1
/AN
8
, P6
4
/INT
4
/S
BUSY1
/AN
10,
and P6
5
/S
STB1
/AN
11
pins each select either I/O port or handshake I/O signal by the
serial I/O1 synchronous clock selection bits (b2 and b3 of address
0019
16
) of serial I/O1 control register 1 as well as the P6
2
/S
RDY1
P6
4
/S
BUSY1
pin control bits (b0 to b3 of address 001A
16
) of serial
I/O1 control register 2.
For the S
OUT1
being used as an output pin, either CMOS output or
N-channel open-drain output is selected by the P5
1
/S
OUT1
P-channel output disable bit (b7 of address 001A
16
) of serial I/O1
control register 2.
Either output active or high-impedance can be selected as a S
OUT1
pin state at serial non-transfer by the S
OUT1
pin control bit (b6 of
address 001A
16
) of serial I/O1 control register 2. However, when
the external synchronous clock is selected, perform the following
setup to put the S
OUT1
pin into a high-impedance state.
When the S
CLK1
input is “H” after completion of transfer, set the
S
OUT1
pin control bit to “1”.
When the S
CLK1
input goes to “L” after the start of the next serial
transfer, the S
OUT1
pin control bit is automatically reset to “0” and
put into an output active state.
Regardless of whether the internal synchronous clock or external
synchronous clock is selected, the full duplex mode and the trans-
mit-only mode are available for serial transfer, one of which is se-
lected by the transfer mode selection bit (b5 of address 0019
16
) of
serial I/O1 control register 1.
Either LSB first or MSB first is selected for the I/O sequence of the
serial transfer bit strings by the transfer direction selection bit (b6 of
address 0019
16
) of serial I/O1 control register 1.
When using serial I/O1, first select either 8-bit serial I/O or auto-
matic transfer serial I/O by the serial transfer selection bits (b0 and
b1 of address 0019
16
) of serial I/O1 control register 1, after comple-
tion of the above bit setup. Next, set the serial I/O initialization bit
(b4 of address 0019
16
) of serial I/O1 control register 1 to “1” (Serial
I/O enable) .
When stopping serial transfer while data is being transferred, re-
gardless of whether the internal or external synchronous clock is
selected, reset the serial I/O initialization bit (b4) to “0”.
Fig. 24 Structure of serial I/O1 control register 3
S
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