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Table 12.7 Maximum Bit Rates with External Clock Input (Synchronous Mode)
φ (MHz)
2
4
6
8
10
12
14
16
18
20
25
12.3
Operation
12.3.1
Overview
The SCI can carry out serial communication in two modes: asynchronous mode in which
synchronization is achieved character by character, and synchronous mode in which
synchronization is achieved with clock pulses. A smart card interface is also supported as a serial
communication function for an IC card interface.
Selection of asynchronous or synchronous mode and the transmission format for the normal serial
communication interface is made in SMR, as shown in table 12.8. The SCI clock source is
selected by the C/A bit in SMR and the CKE1 and CKE0 bits in SCR, as shown in table 12.9.
For details of the procedures for switching between LSB-first and MSB-first mode and inverting
the data logic level, see section 13.2.1, Smart Card Mode Register (SCMR).
For selection of the smart card interface format, see section 13.3.3, Data Format.
338
External Input Clock (MHz)
0.3333
0.6667
1.0000
1.3333
1.6667
2.0000
2.3333
2.6667
3.0000
3.3333
4.1667
Maximum Bit Rate (bit/s)
333333.3
666666.7
1000000.0
1333333.3
1666666.7
2000000.0
2333333.3
2666666.7
3000000.0
3333333.3
4166666.7
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