
Rev. 1.0, 09/01, page 696 of 904
When the serial data is 1, no pulse is output.
UART frame
Data
IR frame
Data
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
Start
bit
Transmit
Receive
Stop
bit
Start
bit
Stop
bit
Bit
cycle
Pulse width
1.6
µ
s to 3/16 bit cycle
Figure 15.34 IrDA Transmit/Receive Operations
Reception: In reception, IR frame data is converted to a UART frame by the IrDA interface, and
input to the SCI.
When a high pulse is detected, 0 data is output, and if there is no pulse during a one-bit interval, 1
data is output. Note that a pulse shorter than the minimum pulse width of 1.41 µs will be identified
as a 0 signal.
High Pulse Width Selection: Table 15.12 shows possible settings for bits IrCKS2 to IrCKS0
(minimum pulse width), and operating frequencies of this LSI and bit rates, for making the pulse
width shorter than 3/16 times the bit rate in transmission.
Содержание H8S/2376 F-ZTAT
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