Datasheet

Section 15 Serial Communication Interface (SCI, IrDA)
R01UH0309EJ0500 Rev. 5.00 Page 937 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
(2) 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.
(3) 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.
Table 15.12 Settings of IrCKS2 to IrCKS0 Bits
Bit Rate (bps) (Above)/Bit Period × 3/16 (µs) (Below)
2400 9600 19200 38400 57600 115200
Operating
Frequency
φ (MHz)
78.13 19.53 9.77 4.88 3.26 1.63
8 100 100 100 100 100 100
9.8304 100 100 100 100 100 100
10 100 100 100 100 100 100
12 101 101 101 101 101 101
12.288 101 101 101 101 101 101
14 101 101 101 101 101 101
14.7456 101 101 101 101 101 101
16 101 101 101 101 101 101
16.9344 101 101 101 101 101 101
17.2032 101 101 101 101 101 101
18 101 101 101 101 101 101
19.6608 101 101 101 101 101 101
20 101 101 101 101 101 101
25 110 110 110 110 110 ⎯
30 110 110 110 110 110 ⎯
33 110 110 110 110 110 ⎯
[Legend]
⎯: A bit rate setting cannot be made on the SCI side.