m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 74

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.4.7. Operation timing of transmission in UART mode
Example of wiring
Example of operation
Transfer clock
Transmit
enable bit (TE)
Transmit buffer
empty flag (Tl)
CTSi
TxDi
Transmit
register empty
flag (TXEPT)
Transmit
interrupt request
bit (IR)
Shown in ( ) are bit symbols.
The above timing applies to the following settings :
• Parity is enabled.
• One stop bit.
• CTS function is selected.
• Transmit interrupt cause select bit = “1”.
“H”
“1”
“0”
“1”
“0”
“L”
“1”
“0”
“1”
“0”
(1) Transmission enabled
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(2) Confirme CTS
(3) Start transmission
Start
ST
bit
Data is set in UARTi transmit buffer register
Microcomputer
Note: Since T
D
0
Tc
D
1
this pin needs pull-up resistance.
D
2
When confirming stop bit, stopped transfer clock once because CTS = “H”
Started transfer clock again to start transmitting immediately after confirming CTS = “L”
D
CTSi
T
3
X
D
Di
X
4
D
Transferred from UARTi transmit buffer register to UARTi transmit register
D
2
5
pin is N-channel open drain,
Cleared to “0” when interrupt request is accepted, or cleared by software
D
6
D
Parity
7
bit
P
Tc = 16 (n + 1) / fi or 16 (n + 1) / f
(4) Confirme stop bit
SP
Stop
bit
fi : frequency of BRGi count source (f
f
n : value set to BRGi
EXT
(5) Start transmission
ST
(Note)
: frequency of BRGi count source (external clock)
D
0
Stopped pulsing because transfer enable bit = “0”
D
1
D
2
D
3
Receiver side IC
R
Port
D
4
X
D
D
5
D
EXT
6
D
7
P SP
1
, f
8
, f
32
)
ST
D
0
D
1
2. UART