m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 73

• 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
Operation
Note
2.4.2 Operation of Serial I/O (transmission in UART mode)
In transmitting data in UART mode, choose functions from those listed in Table 2.4.4. Operations of the
circled items are described below. Figure 2.4.7 shows the operation timing, and Figures 2.4.8 and 2.4.9
show the set-up procedures.
Table 2.4.4. Choosed functions
(1) Setting the transmit enable bit to “1” and writing transmission data to the UARTi transmit
(2) When input to the CTSi pin goes to “L”, transmission starts (the CTSi pin needs to be con-
(3) Transmission data held in the UARTi transmit buffer register is transmitted to the UARTi
(4) When the stop bit(s) is (are) transmitted, the transmit register empty flag goes to “1”, which
(5) If the transmission condition of the next data is ready when transmission is completed, a start
• Set CTSi pin's port direction register to “0”.
Transmission
interrupt factor
Transfer clock
source
CTS function
buffer register readies the data transmissible status.
trolled on the reception side).
transmit register. At this time, the first bit (the start bit) of the transmission data is transmitted
from the TxDi pin. Then, data is transmitted, bit by bit, in sequence: LSB, ····, MSB, parity bit,
and stop bit(s).
indicates that transmission is completed. At this time, the UARTi transmit interrupt request bit
goes to “1”. The transfer clock stops at “H” level.
bit is generated following to stop bit(s), and the next data is transmitted.
_______
Item
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O
O
O
________
CTS function disabled
Transmission complete
Internal clock (f
External clock (CLKi pin)
CTS function enabled
Transmission buffer empty
Set-up
1
/ f
8
/ f
32
)
Data logic select
function
T
polarity reverse bit
Bus collision
detection function
X
D, R
X
Item
D I/O
O
O
O
________
No reverse
Reverse
No reverse
Reverse
Not selected
Selected
Set-up
2. UART