M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 132
M30622M4
Manufacturer Part Number
M30622M4
Description
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Manufacturer
MITSUBISHI [Mitsubishi Electric Semiconductor]
Datasheet
1.M30622M4.pdf
(276 pages)
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Part Number:
M30622M4A-462GP D3
Manufacturer:
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20 000
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Clock asynchronous serial I/O (UART) mode
132
Figure 1.19.16. Typical transmit timings in UART mode(UART0,UART1)
• Example of transmit timing when transfer data is 8 bits long (parity enabled, one stop bit)
• Example of transmit timing when transfer data is 9 bits long (parity disabled, two stop bits)
Transfer clock
Transmit enable
bit(TE)
Transmit buffer
empty flag(TI)
CTSi
TxDi
Transmit register
empty flag (TXEPT)
Transmit interrupt
request bit (IR)
Transfer clock
Transmit buffer
empty flag(TI)
Transmit interrupt
request bit (IR)
Transmit enable
bit(TE)
TxDi
Transmit register
empty flag (TXEPT)
Shown in ( ) are bit symbols.
The above timing applies to the following settings :
Shown in ( ) are bit symbols.
• Parity is enabled.
• One stop bit.
• CTS function is selected.
• Transmit interrupt cause select bit = “1”.
The above timing applies to the following settings :
• Parity is disabled.
• Two stop bits.
• CTS function is disabled.
• Transmit interrupt cause select bit = “0”.
“H”
“1”
“0”
“1”
“0”
“L”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
Start
Start
ST
ST
bit
bit
Data is set in UARTi transmit buffer register
Cleared to “0” when interrupt request is accepted, or cleared by software
D
D
Data is set in UARTi transmit buffer register.
0
0
D
D
1
1
Tc
D
D
2
2
D
D
3
3
Tc
D
D
4
4
The transfer clock stops momentarily as CTS is “H” when the stop bit is checked.
The transfer clock starts as the transfer starts immediately CTS changes to “L”.
Transferred from UARTi transmit buffer register to UARTi transmit register
D
D
5
5
D
D
6
6
Transferred from UARTi transmit buffer register to UARTi transmit register
D
D
Tc = 16 (n + 1) / fi or 16 (n + 1) / f
Parity
7
7
bit
D
P
fi : frequency of BRGi count source (f
f
n : value set to BRGi
8
EXT
Stop
Cleared to “0” when interrupt request is accepted, or cleared by software
Tc = 16 (n + 1) / fi or 16 (n + 1) / f
bit
SP
Stop
SP
bit
: frequency of BRGi count source (external clock)
SP
fi : frequency of BRGi count source (f
f
n : value set to BRGi
EXT
Stop
ST
bit
ST
: frequency of BRGi count source (external clock)
D
D
0
0
D
D
1
1
D
D
2
2
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Stopped pulsing because transmit enable bit = “0”
D
D
3
3
EXT
D
D
4
4
D
D
5
EXT
5
1
D
, f
D
6
8
6
, f
D
D
32
7
1
7
, f
)
P SP
D
8
8
, f
32
SPSP
)
Mitsubishi microcomputers
M16C / 62 Group
ST
ST
D
0
D
D
0
1
D
1
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