參數(shù)資料
型號: M38C29MC-XXXHP
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): 31/63頁
文件大?。?/td> 1000K
代理商: M38C29MC-XXXHP
31
38C2 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) can be selected by clear-
ing the serial I/O mode selection bit of the serial I/O control register
to
0
.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer, but the
two buffers have the same address in memory. Since the shift regis-
ter cannot be written to or read from directly, transmit data is written
to the transmit buffer register, and receive data is read from the re-
ceive buffer register.
The transmit buffer register can also hold the next data to be trans-
mitted, and the receive buffer register can hold a character while the
next character is being received.
Fig. 27 Block diagram of UART serial I/O
f(X
IN
)
(f(X
CIN
) in low-speed mode)
1/4
OE
PE FE
1/16
1/16
Data bus
Receive buffer register
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Baud rate generator
Address 0FE2
16
[Address 0FE5
16
]
Frequency division ratio 1/(n+1)
ST/SP/PA generator
Transmit buffer register
Address 001C
16
[Address 001E
16
]
Data bus
Transmit shift register
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Serial I/O status register
Transmit interrupt request (TI)
ST detector
SP detector
UART control register
Address 0FE1
16
[Address 0FE4
16
]
Character length selection bit
BRG count source selection bit
Transmit interrupt source selection bit
Serial I/O synchronous clock selection bit
Clock control circuit
Character length selection bit
7 bits
8 bits
Serial I/O control register
P5
6
/S
CLK1
[P3
1
/S
CLK2
]
P5
4
/R
X
D
1
[P3
3
/R
X
D
2
]
P5
5
/T
X
D
1
[P3
2
/T
X
D
2
]
Address 001C
16
[Address 001E
16
]
Address 001D
16
[Address 001F
16
]
Address 0FE0
16
[Address 0FE3
16
]
[ ] : For Serial I/O2
Fig. 28 Operation of UART serial I/O function
TSC=0
TBE=1
RBF=0
TBE=0
TBE=0
RBF=1
RBF=1
ST
D
0
D
1
SP
D
0
D
1
ST
SP
TBE=1
TSC=1
ST
D
0
D
1
SP
D
0
D
1
ST
SP
Transmit or receive clock
Transmit buffer write
signal
Generated at 2nd bit in 2-stop-bit mode
1 start bit
7 or 8 data bit
1 or 0 parity bit
1 or 2 stop bit (s)
1:
Error flag detection occurs at the same time that the RBF flag becomes
1
(at 1st stop bit, during reception).
2:
As the transmit interrupt (TI), when either the TBE or TSC flag becomes
1,
can be selected to occur depending on the setting of the transmit
interrupt source selection bit (TIC) of the serial I/O control register.
3:
The receive interrupt (RI) is set when the RBF flag becomes
1.
4:
After data is written to the transmit buffer when TSC=1, 0.5 to 1.5 cycles of the data shift cycle is necessary until changing to TSC=0.
Notes
Serial output T
X
D
Serial input R
X
D
Receive buffer read
signal
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