
642
Chapter 32 USART (LIN / FIFO)
6.USART Baud Rates
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Transmission Interrupt Request Generation Timing
If the TDRE flag is set to 1 when a transmission interrupt is enabled (SSR04: TIE=1) a transmission interrupt
request is generated.
A transmission completion interrupt is generated immediately after the transmission interrupt is enabled
(TIE=1) because the TDRE bit is set to 1 as its initial value. TDRE is a read-only bit that can be cleared only
by writing new data to the output data register (TDR04). Carefully specify the transmission interrupt enable
timing.
6. USART Baud Rates
One of the following can be selected for the USART serial clock source:
• Dedicated baud rate generator (Reload Counter)
• External clock as it is (clock input to the SCK04 pin)
• External clock connected to the baud rate generator (Reload Counter)
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USART Baud Rate Selection
The baud rate selection circuit is designed as shown below. One of the following three types of baud rates can
be selected:
• Baud Rates Determined Using the Dedicated Baud Rate Generator (Reload Counter)
USART has two independent internal reload counters for transmission and reception serial clock. The baud rate can be
selected via the 15-bit reload value determined by the Baud Rate Generator Register 0 and 1 (BGR0/1).
The reload counter divides the peripheral clock by the value set in the Baud Rate Generator Register 0 and 1.
• Baud Rates determined using external clock (one-to-one mode)
The clock input from USART clock pulse input pins (SCK04) is used as it is (synchronous). Any baud rate less than the
peripheral clock divided by 4 and is divisible can be set externally
• Baud Rates determined using the dedicated baud rate generator with external clock
An external clock source can also be connected internally to the reload counter. In this mode it is used instead of the
internal peripheral clock. This was designed to use quartz oscillators with special frequencies and having the possibility
to divide them.
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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