ML620Q503/Q504 User's Manual
Chapter 13 UART
FEUL620Q504
13–12
13.3.2
Baud Rate
Baud rates are generated by the baud rate generator.
The baud rate generator generates a baud rate by counting the clock selected by the baud rate clock selection bits
(U0CK1, U0CK0) of the UART0 mode register 0 (UA0MOD0). The count value of the baud rate generator can
be set by writing it in the UART0 baud rate register (UA0BRT). The maximum count is 4096.
The setting value of UA0BRT is expressed by the following equation.
UA0BRT =
Clock frequency (Hz)
-1
Baud rate (bps)
Table 13-1 lists the count values for typical baud rates.
Table 13-1 Count Values for Typical Baud Rates
Baud rate
Baud rate generator
clock selection
Baud rate generator counter value
Error
*1
Baud rate clock
Count value
Period of cycle
UA0BRT
4800bps
16MHz
3333
Approx. 208us
0D04H
0.01%
9600bps
1667
Approx. 104us
0682H
-0.02%
19200bps
833
Approx. 52us
0340H
0.04%
38400bps
417
Approx. 26us
01A0H
-0.08%
57600bps
278
Approx. 17.4us
0115H
-0.08%
115200bps
139
Approx. 8.7us
008AH
-0.08%
*1:The error does not include the clock error. Use this in consideration of an error of Baud rate clock.
Summary of Contents for LAPIS SEMICONDUCTOR ML620Q503
Page 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Page 18: ...Chapter 1 Overview...
Page 32: ...Chapter 2 CPU and Memory Space...
Page 44: ...Chapter 3 Reset Function...
Page 50: ...Chapter 4 Power Management...
Page 70: ...Chapter 5 Interrupts...
Page 134: ...Chapter 6 Clock Generation Circuit...
Page 161: ...Chapter 7 Time Base Counter...
Page 170: ...Chapter 8 Timers...
Page 183: ...Chapter 9 Function Timer FTM...
Page 231: ...Chapter 10 Watchdog Timer...
Page 239: ...Chapter 11 Synchronous Serial Port SSIO...
Page 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Page 283: ...Chapter 13 UART...
Page 303: ...Chapter 14 UART with FIFO UARTF...
Page 327: ...Chapter 15 I2 C Bus Interface...
Page 344: ...Chapter 16 Port XT...
Page 350: ...Chapter 17 Port 0...
Page 361: ...Chapter 18 Port 1...
Page 368: ...Chapter 19 Port2...
Page 379: ...Chapter 20 Port 3...
Page 395: ...Chapter 21 Port 4...
Page 410: ...Chapter 22 Port 5...
Page 426: ...Chapter 23 Melody Driver...
Page 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Page 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Page 479: ...Chapter 26 Analog Comparator...
Page 489: ...Chapter 27 Flash Memory Control...
Page 505: ...Chapter 28 Voltage Level Supervisor VLS...
Page 517: ...Chapter 29 LLD circuit...
Page 519: ...Chapter 30 On Chip Debug Function...
Page 522: ...Appendixes...
Page 552: ...Revision History...