Uart Clock Selection - Fujitsu F2MC-16LX Hardware Manual

17.4.1 UART Clock Selection

The following three kinds of UART clocks can be selected:
• Communication prescaler
• Internal timer
• External clock
■ Communication Prescaler
When the communication prescaler is selected, the following baud rates are available:
Table 17.4-2 Baud Rates (Asynchronous (Start-Stop Synchronous) Mode)
CS2 CS1
0 0
0 0
0 1
0 1
1 0
φ: Machine clock
Table 17.4-3 Baud Rates (CLK-synchronous Mode)
CS2 CS1
0 0
0 0
0 1
0 1
1 0
φ: Machine clock
div: Setting of communication prescaler (For more information, see "CHAPTER 16 COMMUNICATION
PRESCALER REGISTER".)
φ/div = 2 MHz
CS0
0 9615 bps
1 4808 bps
0 2404 bps
1 1202 bps
0 31250 bps
φ/div = 2 MHz
CS0
0 1 Mbps
1 500 kbps
0 250 kbps
1 125 kbps
0 62.5 kbps
φ/div = 4 MHz
Expression for calculation
(φ/div)/(8 × 13 × 2)
19230 bps
9615 bps (φ/div)/(8 × 13 × 2
4808 bps (φ/div)/(8 × 13 × 2
2404 bps (φ/div)/(8 × 13 × 2
(φ/div)/ 2
62500 bps
φ/div = 4 MHz
Expression for calculation
2 Mbps (φ/div)/2
1 Mbps (φ/div)/2
(φ/div)/2
500 kbps
250 kbps (φ/div)/ 2
125 kbps (φ/div)/ 2
17.4 UART Operations
2
)
3
)
4
)
6
2
3
4
5
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