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參數(shù)資料
| 型號： | M38B5 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機) |
| 中文描述： | 單芯片8位單片機（8位單片機） |
| 文件頁數(shù)： | 24/69頁 |
| 文件大?。?/td> | 1011K |
| 代理商： | M38B5 |
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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
24
PRELIMINARY
Notice: This s not a final specification.
Some parametric imits are subject to change.
Serial I/O
G
Serial I/O1
Serial I/O1 is used as the clock synchronous serial I/O and has an
ordinary mode and an automatic transfer mode. In the automatic
transfer mode, serial transfer is performed through the serial I/O
automatic transfer RAM which has up to 256 bytes (addresses
0F00
16
to 0FFF
16
: addresses 0F60
16
to 0FFF
16
are also used as
Fig. 19 Block Diagram of Serial I/O1
FLD automatic display RAM).
The P6
2
/S
RDY1
/AN
8
, P6
4
/INT
4
/S
BUSY1
/AN
10
, and P6
5
/S
STB1
/AN
11
pins each have a handshake I/O signal function and can select
either “H” active or “L” active for active logic.
Main
data bus
Serial I/O1
automatic transfer
controller
Local
data bus
Serial I/O automatic
transfer RAM
(0F00
16
—0FFF
16
)
Serial I/O1
control register 3
X
CIN
X
IN
Internal system
clock selection bit
Serial I/O1
automatic transfer
data pointer
Address decoder
Main address
bus
Local address
bus
“1”
“0”
1/8
1/16
1/32
1/64
1/128
1/256
Serial I/O1
interrupt request
P6
4
latch
Serial I/O1 counter
Synchronous
circuit
S
C
Serial I/O1
synchronous clock
selection bit
“1”
Serial I/O1 clock
pin selection bit
P6
2
latch
“0”
P5
2
/S
CLK11
“0”
“1”
“1”
“0”
Internal synchronous
clock selection bits
P6
5
latch
P6
4
/S
BUSY1
P6
5
/S
STB1
(P6
5
/S
STB1
pin control bit)
Serial transfer
status flag
“0”
“1”
“0”
“1”
P6
2
/S
RDY1
“1”
P5
2
latch
P5
1
/S
OUT1
P5
0
/S
IN1
P5
1
latch
Serial I/O1 register (8)
“0”
“1” Serial transfer selection bits
1/2
D
1/4
P5
3
/S
CLK12
“0”
P5
3
latch
“0”
“1”
Serial I/O1 clock
pin selection bits
“0”
“1”
P6
/S
P6
4
/S
BUSY1
pin control bit
P6
2
/S
RDY1
P6
4
/S
BUSY1
pin control bit
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