參數(shù)資料
型號(hào)： M38749MFT-XXXGP
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)： 32/92頁(yè)
文件大?。?/td> 1292K
代理商： M38749MFT-XXXGP
38
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Serial I/O2
The Serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O2, the transmitter and the receiver
must use the same clock. When the internal clock is used, transfer
is started by a write signal to the serial I/O2 register.
[Serial I/O2 Control Register (SIO2CON)]
001D16
The serial I/O2 control register contains 8 bits which control vari-
ous serial I/O functions.
Fig. 32 Block diagram of serial I/O2
Fig. 31 Structure of serial I/O2 control register
Serial I/O2 internal synchronous clock selection bits
b2 b1 b0
0 0 0 : f(XIN)/8 or f(XCIN)/8
0 0 1 : f(XIN)/16 or f(XCIN)/16
0 1 0 : f(XIN)/32 or f(XCIN)/32
0 1 1 : f(XIN)/64 or f(XCIN)/64
1 0 0 :
1 0 1 :
1 1 0 : f(XIN)/128 or f(XCIN)/128
1 1 1 : f(XIN)/256 or f(XCIN)/256
SOUT2 pin selection bit
0 : I/O port
1 : SOUT2 output pin
P71/SOUT2 P72/SCLK2 P-channel output disable bit
In output mode
0 : CMOS 3 state
1 : N-channel open-drain output
Serial I/O2 transfer direction selection bit
0 : LSB first
1 : MSB first
SCLK2 pin selection bit
0 : External clock (SCLK2 function as an I/O port.)
1 : Internal clock (SCLK2 function as an output port.)
SOUT2 output control bit
(when serial data is not transferred)
0 : Output active
1 : High-impedance
Serial I/O2 control register
(SIO2CON : address 001D16)
b7
b0
Do not set
SCLK2 pin
selection bit
External clock
P72/SCLK2
P71/SOUT2
P70/SIN2
P72 latch
P71 latch
Serial I/O2 counter (3)
Serial I/O2 register (8)
Serial I/O2
interrupt request
Main clock divide ratio
selection bit CM7
“1”
“0”
“1”
“0”
“1”
SCLK2
Divider
1/8
1/16
1/32
1/64
1/128
1/256
Serial I/O2 internal
synchronous clock
selection bits
SCLK2 pin selection bit
SOUT2 pin selection bit
XCIN
XIN
“10”
“00,01,11”
Data bus
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