HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 402

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Serial Communication Interface (SCI)
Table 13.7 Maximum Bit Rates with External Clock Input (Synchronous Mode)
2
4
6
8
10
12
14
16
18
20
13.3
13.3.1
The SCI has an asynchronous mode in which characters are synchronized individually, and a
synchronous mode in which communication is synchronized with clock pulses. Serial
communication is possible in either mode. Asynchronous/synchronous mode and the
communication format are selected in the serial mode register (SMR), as shown in table 13.8. The
SCI clock source is selected by the C/A bit in the serial mode register (SMR) and the CKE1 and
CKE0 bits in the serial control register (SCR), as shown in table 13.9.
Asynchronous Mode:
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REJ09B0272-0700
(MHz)
Data length is selectable: seven or eight bits.
Parity and multiprocessor bits are selectable, and so is the stop bit length (one or two bits). The
preceding selections constitute the communication format and character length.
In receiving, it is possible to detect framing errors (FER), parity errors (PER), overrun errors
(ORER), and the break state.
An internal or external clock can be selected as the SCI clock source.
When an internal clock is selected, the SCI operates using the on-chip baud rate generator,
and can output a serial clock signal with a frequency matching the bit rate.
When an external clock is selected, the external clock input must have a frequency 16 times
the bit rate. (The on-chip baud rate generator is not used.)
Operation
Overview
External Input Clock (MHz)
0.3333
0.6667
1.0000
1.3333
1.6667
2.0000
2.3333
2.6667
3.0000
3.3333
333333.3
666666.7
1000000.0
1333333.3
1666666.7
2000000.0
2333333.3
2666666.7
3000000.0
3333333.3
Maximum Bit Rate (bits/s)