Fujitsu MB89202, F202RA manual Configuration of Uart, Block Diagram of Uart

CHAPTER 13 UART

13.2Configuration of UART

UART consists of the following ten registers and components:

•Serial mode control register (SMC)

•Serial rate control register (SRC)

•Serial status and data register (SSD)

•Serial input data register (SIDR)

•Serial output data register (SODR)

•Baud rate generator

•Reception control circuit

•Transmission control circuit

•Clock divider selection register (UPC)

•UART prescaler

■Block Diagram of UART

Figure 13.2-1 Block Diagram of UART

			Control bus
			Reception		UART
					interrupt	RIE
			interrupt					IRQ6
		Transmission		Transmission		Transmission
		clock
P30/UCK/SCK				control circuit		interrupt		IRQ5
		Reception control
						TIE
Pin		circuit
			Received		Transmitted
	Baud rate		byte		byte counter
			counter
	generator				Parity
			Start bit		transmission		P31/UO/SO
					timing
UART			detection
			circuit					Pin
prescaler			Parity	RP	Parity	TP
	Reception clock
PREN	PR2,1,0		Shift register		Shift register
Clock				Completion
divider			Register		Register
				of receipt of
selection	P32/UI/SI			one byte	<Serial output
register		<Serial input data
	Pin	register (SIDR)>			data register
(UPC)					(SODR)>
		Internal data bus
		PEN					RDRF
							ORFE
	Serial mode	SBL	Serial rate		Serial status
							TDREX
	control	MC1/0	control		and data
							TIE
	register	SMDE	register	CR	register
	(SMC)		(SRC)	CS1/0	(SSD)		RIE
		SCKE
				RC2 to 0			TP
		SOE
							RP
						Control bus

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