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參數(shù)資料
| 型號： | M38021M6 |
| 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 |
| 文件頁數(shù)： | 22/51頁 |
| 文件大?。?/td> | 692K |
| 代理商： | M38021M6 |
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MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
22
Serial I/O2
The serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O the transmitter and the receiver
must use the same clock. If 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 seven bits which control
various serial I/O functions.
Fig. 15 Structure of serial I/O2 control register
Fig. 16 Block diagram of serial I/O2 function
X
IN
"1"
"0"
"0"
"0"
"1"
S
RDY2
S
C
"0"
"1"
1/8
1/16
1/32
1/64
1/128
1/256
Data bus
Serial I/O2
interrupt request
Serial I/O2 port selection bit
Serial I/O counter 2 (3)
Serial I/O shift register 2 (8)
Synchronization circuit
Serial I/O2 por"1"
Serial I/O2 synchronous
clock selection bit
S
RDY2
output enable bit
External clock
Internal synchronous
clock selection bits
D
P5
3
latch
P5
3
/S
RDY2
P5
2
/S
CLK2
P5
1
/S
OUT2
P5
0
/S
IN2
P5
2
latch
P5
1
latch
Serial I/O2 control register
(SIO2CON : address 001D
16
)
b7
0 0 0: f(X
IN
)/8
0 0 1: f(X
IN
)/16
0 1 0: f(X
IN
)/32
0 1 1: f(X
IN
)/64
1 1 0: f(X
IN
)/128
1 1 1: f(X
IN
)/256
Serial I/O2 port selection bit (SM2
3
)
0: I/O port
1: S
OUT2
,S
CLK2
output pin
S
RDY2
output enable bit (SM2
4
)
0: I/O port
1: S
RDY2
output pin
Transfer direction selection bit (SM2
5
)
0: LSB first
1: MSB first
Serial I/O2 synchronous clock selection bit (SM2
6
)
0: External clock
1: Internal clock
P5
1
/S
OUT2
P-channel output disable bit
0: CMOS output (in output mode)
1: N-channel open-drain output (in output mode)
b0
b2 b1 b0
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