Fujitsu F202RA, MB89202 manual Sbl, Smde, Scke, Soe, 291

CHAPTER 13 UART

Table 13.4-1 Explanation of Functions of Each Bit in the Serial Mode Control Register (SMC)

	Bit name		Description
bit7	PEN:	This bit selects whether the parity bit is to be added (at transmission) and
	Parity enable bit	detected (at reception) when serial data is input/output.
		This bit selects the stop bit length for data to be transmitted.
bit6	SBL:	Note:
	Stop bit length selection bit		When data is received, only the first bit of stop bits is detected and the
			second and later bits are ignored.
bit5,	MC1, MC0:	• These bits specify operating mode (data length).
		• There are 7 types of data length selectable in combination with a parity
bit4	Operating mode selection bits
			bit.
	SMDE:	• This bit specifies synchronous transfer or asynchronous transfer mode.
bit3	Synchronization mode selection	• When this bit is "0", synchronous transfer mode is set. When this is "1",
	bit		asynchronous transfer mode is set.
bit2	Unused bit	• The value read out from this bit is undefined.
		• Writing a value into this bit does not affect any operations.
		• This bit controls I/O of the serial clock.
		• When this bit is "0", P30/UCK/SCK pin functions as the serial clock
			input pin. When this bit is "1", it functions as the serial clock output
			pin.
		Notes:
		•	When the UCK pin functions as the serial clock input pin (SCKE = 0),
	SCKE:		set the P30/UCK/SCK pin as the input port. Also, select the external
bit1			clock using the clock input selection bit (SRC: CS1 and CS0 = 00B).
	Clock output enable bit
		•	When the UCK pin is set as the serial clock output pin (SCKE = 1),
			select a clock other than the external clock (SRC: CS1 and CS0 must
			not be 00B).
		Note:
			When the UCK pin is specified as the serial clock output (SCKE = 1), it
			functions as the UCK output pin regardless of the state of the general-
			purpose port (P30).
		When this bit is "0", the P31/UO/SO pin functions as a general-purpose
		port (P31). When this bit is "1", it functions as the serial data output pin
bit0	SOE:	(UO).
	Serial data output enable bit	Note:
			When serial data output is enabled (SOE = 1), the pin functions as the
			UO pin regardless of the state of the general-purpose port (P31).

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