參數(shù)資料
型號(hào)： M37905M4C-XXXSP
廠商： Mitsubishi Electric Corporation
英文描述： 16 BIT CMOS MICROCOMPUTER
中文描述： 16位CMOS微機(jī)
文件頁(yè)數(shù)： 62/102頁(yè)
文件大?。?/td> 881K
代理商： M37905M4C-XXXSP
62
M37905M4C-XXXFP, M37905M4C-XXXSP
M37905M6C-XXXFP, M37905M6C-XXXSP
M37905M8C-XXXFP, M37905M8C-XXXSP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 69 Transmit timing example when 8-bit asynchronous communication with parity and 1 stop bit selected
Fig. 70 Transmit timing example when 9-bit asynchronous communication with no parity and 2 stop bits selected
ASYNCHRONOUS
SERIAL COMMUNICATION
Asynchronous serial communication can be performed using 7-, 8-, or
9-bit length data. The operation is the same for all data lengths. The
following is the description for 8-bit asynchronous communication.
With 8-bit asynchronous communication, bit 0 of UARTi transmit/re-
ceive mode register is
“
1
”
, bit 1 is
“
0
”
, and bit 2 is
“
1
”
.
Bit 3 is used to select an internal clock or an external clock. If bit 3 is
“
0
”
, an internal clock is selected and if bit 3 is
“
1
”
, then external clock
is selected. If an internal clock is selected, bit 0 (CS
0
) and bit 1 (CS
1
)
of UARTi transmit/receive control register 0 are used to select the
clock source. When an internal clock is selected for asynchronous
serial communication, the CLK
i
pin can be used as a normal I/O pin.
The selected internal or external clock is divided by (n + 1), then by
16, and is passed through a control circuit to create the UART trans-
mission clock or UART receive clock.
Therefore, the transmission speed can be changed by changing the
contents (n) of the bit rate generator. If the selected clock is an inter-
nal clock Pfi or an external clock f
EXT
,
Bit Rate = (fi or f
EXT
) / {(n+1)
×
16}
Bit 4 is the stop bit length select bit to select 1 stop bit or 2 stop bits.
Bit 5 is a select bit of odd parity or even parity.
In the odd parity mode, the parity bit is adjusted so that the sum of 1s
in the data and parity bit is always odd.
In the even parity mode, the parity bit is adjusted so that the sum of
the 1s in the data and parity bit is always even.
Bit 6 is the parity bit select bit which indicates whether to add parity
bit or not.
Bits 4 to 6 must be set or reset according to the data format used in
the communicating devices.
Bit 7 is the sleep select bit. The sleep mode is described later.
Figure 72 shows the bit configuration of the serial I/O pin control reg-
ister. By bits 0, 1 and 4 of the serial I/O pin control register (CTSi/
RTSi separate select bits), the function of the CTS/RTS pin can be
separated into two functions, and each function can be assigned to
two different pins. When each of bits 0, 1 and 4 =
“
1
”
, the above
separation is performed. When each of bits 0, 1 and 4 =
“
0
”
, no sepa-
ration is performed.
Table 8 lists the selection methods of the CTS/RTS function.
(1/f
i
or 1/f
EXT
)
×
(n
+
1)
×
16
Written in transmit buffer register
Transmission clock
TE
i
TI
i
CTS
i
T
ENDi
T
X
D
i
T
X
EPTY
i
D
0
D
1
ST
Start bit
Parity bit Stop bit
D
2
D
3
D
4
D
5
D
6
D
7
P
SP ST D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
P
SP
ST D
0
D
1
Transmit register
←
Transmit
buffer register
Stopped because TE
i
=
“
0
”
(1/f
i
or 1/f
EXT
)
×
(n + 1)
×
16
Written in transmit buffer register
Transmission clock
TE
i
TI
i
T
ENDi
T
X
D
i
T
X
EPTY
i
D
0
D
1
ST
D
2
D
3
D
4
D
5
D
6
D
7
D
8
SP
SP
ST D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
8
SP SP
ST D
0
D
2
D
1
Transmit register
←
Transmit
buffer register
Stopped because TE
i
=
“
0
”
Start bit
Stop bit
Stop bit
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37905M6C-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
M37905M6C-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
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