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CHAPTER 17 UART
●
Synchronous transfer clock division ratios
A division ratio for synchronous baud rates is selected using the CS2 to CS0 bits of the mode control
register (SMR0/SMR1) as listed in Table 17.6-2.
Note that the calculation is supposing that
φ
(machine cycle) = 16 MHz and div (machine clock division
ratio) = 8. The maximum baud rate is 1/8 machine clock.
●
Asynchronous transfer clock division ratios
A division ratio for asynchronous baud rates is selected using the CS2 to CS0 bits of the mode control
register (SMR0/SMR1) as listed in Table 17.6-3.
Note that the calculation is supposing that
φ
(machine clock) = 16 MHz, div (machine clock division ratio) = 1.
Table 17.6-2 Selection of Synchronous Baud Rate Division Ratios
CS2
CS1
CS0
CLK synchronization
Calculation formula
0
0
0
2 MHz
(
φ
÷
div) / 1
0
0
1
1 MHz
(
φ
÷
div) / 2
0
1
0
500 kHz
(
φ
÷
div) / 4
0
1
1
250 kHz
(
φ
÷
div) / 8
1
0
0
125 kHz
(
φ
÷
div) / 16
1
0
1
62.5 kHz
(
φ
÷
div) / 32
Table 17.6-3 Selection of Asynchronous Baud Rate Division Ratios
CS2
CS1
CS0
Asynchronous (start-stop
synchronization)
Calculation formula
0
0
0
76923 Hz
(
φ
÷
div)
/ (8
×
13
×
2
)
0
0
1
38461 Hz
(
φ
÷
div)
/ (8
×
13
×
4
)
0
1
0
19230 Hz
(
φ
÷
div) /
(8
×
13
×
8
)
0
1
1
9615 Hz
(
φ
÷
div) /
(8
×
13
×
16
)
1
0
0
500 kHz
(
φ
÷
div) /
(8
×
2
×
2
)
1
0
1
250 kHz
(
φ
÷
div) /
(8
×
2
×
4
)
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......