m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 77

• 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
2.4.3 Operation of Serial I/O (reception in UART mode)
In receiving data in UART mode, choose functions from those listed in Table 2.4.5. Operations of the
circled items are described below. Figure 2.4.10 shows the operation timing, and Figures 2.4.11 and
2.4.12 show the set-up procedures.
Table 2.4.5. Choosed functions
(1) Setting the receive enable bit to “1” readies data-receivable status. At this time, output from
(2) When the first bit (the start bit) of reception data is received from the RxDi pin, output from the
(3) When the stop bit(s) is (are) received, the content of the UARTi receive register is transmitted
(4) The receive complete flag goes to “0” when the lower-order byte of the UARTi buffer register
• Set RxDi pin's port direction register to “0”.
Transfer clock
source
RTS function
Data logic select
function
the RTSi pin goes to “L” level to inform the transmission side that the receivable status is
ready.
RTS goes to “H” level. Then, data is received, bit by bit, in sequence: LSB, ····, MSB, and stop
bit(s).
to the UARTi receive buffer register. At this time, the receive complete flag goes to “1” to
indicate that the reception is completed, the UARTi receive interrupt request bit goes to “1”,
and output from the RTS pin goes to “L” level.
is read.
_______
________
Item
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O
O
O
RTS function disabled
Internal clock (f
External clock (CLKi pin)
RTS function enabled
No reverse
Reverse
_______
Set-up
1
/ f
8
/ f
32
)
T
polarity reverse bit
Bus collision
detection function
X
D, R
X
Item
D I/O
O
O
No reverse
Reverse
Not selected
Selected
Set-up
2. UART