Fujitsu MB89202, F202RA manual Serial Rate Control Register SRC

CHAPTER 13 UART

13.4.2Serial Rate Control Register (SRC)

The serial rate control register (SRC) controls the data transfer rate (baud rate) in asynchronous transfer mode. The SRC selects the input clock and sets the transfer rate for the dedicated baud rate generator.

■Serial Rate Control Register (SRC)

Figure 13.4-3 Serial Rate Control Register (SRC)

Address	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0	Initial value
0029H			CR	CS1 CS0		RC2	RC1 RC0 --011000B
			R/W	R/W	R/W	R/W	R/W	R/W
					RC2	RC1	RC0				Baud rate selection bits
								Asynchronous (∝s/baud)				Synchronous (∝s/baud)
					0	0	0		83/12019			0.8/1.25M
					0	0	1			166/6010		1.6/625k
					0	1	0			333/3005		3.2/313k
					0	1	1			666/1503		6.4/156k
					1	0	0			1331/751		12.8/78k
					1	0	1			2662/375		25.6/39k
					1	1	0			13/78125		1.6/625k
					1	1	1			102/9766		12.8/78k
											Clock input selection bits
					CS1	CS0	Clock input				CR bit	Clock frequency divider
												Asynchronous Synchronous
					0	0	External clock				0	16	1
											1	64
					0	1	PWM timer output				0	16	2
											1	64
					1	0		Unused
					1	1	Dedicated baud				0	8	1
							rate generator				1
					CR			Clock rate input selection bit
						Effective only in asynchronous transfer mode (SMC: SMDE = 1)*
					0 1/16 of the clock input
R/W	: Readable/Writable				1	1/64 of the clock input
					* : However, when the dedicated baud rate generator is used (CS1 and CS0 = 11B),
	: Unused
					it is fixed at 1/8.
	: Initial value

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