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3. Operation
Figure 3 shows the operation of asynchronous mode data transmission in the task example. To
help explain figure 3, table 3 lists the software and hardware processing that is performed.
TxD1
(pin)
RDRF
(SSR_1 bit)
Receive operation
Transmit operation
TDR_1
(register)
TSR_1
(register)
TXD1
(pin)
TDRE
(SSR_1 bit)
Notes: 1. The start bit, transmit data, parity bit, and stop bit are output, in that order, from the TxD1 pin.
2. To perform continuous reception, read data transferred to RDR until reception of next data is
complete.
REJ06B0357-0100O/Rev.1.00
Asynchronous Serial Data Transmission/Reception
(1)
(2)
Data
Start
Stop
bits
bit
bit
0
1
Figure 3
Data Transmission Operation
March 2004
(3)
(6)
(4) (5)
(7) (8)
Start
bit
Data bits D0 to D7
0
Start
bit
0
SH7145F
(9)
(11)
(14)
(10)
(12) (13)
(15)
Data bits D0 to D7
Page 6 of 17
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