參數(shù)資料
型號: M38747MCF
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): 38/92頁
文件大?。?/td> 1292K
代理商: M38747MCF
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)]
001D
16
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(X
IN
)/8 or f(X
CIN
)/8
0 0 1 : f(X
IN
)/16 or f(X
CIN
)/16
0 1 0 : f(X
IN
)/32 or f(X
CIN
)/32
0 1 1 : f(X
IN
)/64 or f(X
CIN
)/64
1 0 0 :
1 0 1 :
1 1 0 : f(X
IN
)/128 or f(X
CIN
)/128
1 1 1 : f(X
IN
)/256 or f(X
CIN
)/256
S
pin selection bit
0 : I/O port
1 : S
OUT2
output pin
P7
/S
P7
2
/S
CLK2
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
S
CLK2
pin selection bit
0 : External clock (S
CLK2
function as an I/O port.)
1 : Internal clock (S
CLK2
function as an output port.)
S
OUT2
output control bit
(when serial data is not transferred)
0 : Output active
1 : High-impedance
Serial I/O2 control register
(SIO2CON : address 001D
16
)
b7
b0
Do not set
S
pin
selection bit
S
CLK2
External clock
P7
2
/S
CLK2
P7
1
/S
OUT2
P7
0
/S
IN2
P7
2
latch
P7
1
latch
Serial I/O2 counter (3)
Serial I/O2 register (8)
Serial I/O2
interrupt request
Main clock divide ratio
selection bit CM
7
“1”
“0”
“0”
“1”
“0”
“1”
D
1/8
1/16
1/32
1/64
1/128
1/256
Serial I/O2 internal
synchronous clock
selection bits
S
CLK2
pin selection bit
S
OUT2
pin selection bit
X
CIN
X
IN
“10”
“00,01,11”
Data bus
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