HD6413007F20 Datasheet, PDF (484/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

13. Serial Communication Interface
Table 13.7 Maximum Bit Rates with External Clock Input (Synchronous Mode)
φ (MHz)
2
4
6
8
10
12
14
16
18
20
External Input Clock (MHz)
0.3333
0.6667
1.0000
1.3333
1.6667
2.0000
2.3333
2.6667
3.0000
3.3333
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
13.3 Operation
13.3.1 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 13.8. 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 13.9.
For details of the procedures for switching between LSB-first and MSB-first mode and inverting
the data logic level, see section 14.2.1, Smart Card Mode Register (SCMR).
For selection of the smart card interface format, see section 14.3.3, Data Format.
Asynchronous Mode
• Data length is selectable: 7 or 8 bits
• Parity and multiprocessor bits are selectable, and so is the stop bit length (1 or 2 bits). These
selections determine the communication format and character length.
• In receiving, it is possible to detect framing errors, parity errors, overrun errors, and the break
state.
Rev.5.00 Sep. 12, 2007 Page 454 of 764
REJ09B0396-0500