HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 512
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HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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Powering On: To secure the clock duty from power-on, the following switching procedure should
be followed.
[1] The initial state is port input and high impedance. Use a pull-up resistor or pull-down resistor
to fix the potential.
[2] Fix the SCK pin to the specified output level with the CKE1 bit in SCR.
[3] Set SMR and SCMR, and switch to smart card mode operation.
[4] Set the CKE0 bit in SCR to 1 to start clock output.
13.4
Usage Note
The following points should be noted when using the SCI as a smart card interface.
Receive Data Sampling Timing and Reception Margin in Smart Card Interface Mode: In
smart card interface mode, the SCI operates on a basic clock with a frequency of 372 times the
transfer rate.
In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs
internal synchronization. Receive data is latched internally at the rising edge of the 186th pulse of
the basic clock. This is illustrated in figure 13.10.
498
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